|2005 Atlantic hurricane season|
Season summary map
|First system formed||June 8, 2005|
|Last system dissipated||January 6, 2006 |
(record latest, tied with 1954)
|Name|| Wilma |
(Most intense hurricane in the Atlantic basin)
|• Maximum winds||185 mph (295 km/h)|
|• Lowest pressure||882 mbar (hPa; 26.05 inHg)|
|Total depressions||31 (record high)|
|Total storms||28 (record high)|
|Hurricanes||15 (record high)|
|7 (record high)|
|Total fatalities||3,912 total|
|Total damage||$171.755 billion (2005 USD)|
(Second-costliest tropical cyclone season on record)
The 2005 Atlantic hurricane season was the most active Atlantic hurricane season in recorded history, shattering numerous records, with 31 tropical or subtropical cyclones recorded. The United States National Hurricane Center named 27 storms, exhausting the annual pre-designated list and resulting in the usage of six Greek letter names. A record 15 storms attained hurricane status, with maximum sustained winds of at least 74 mph (119 km/h); of those, a record seven became major hurricanes, which are a Category 3 or higher on the Saffir-Simpson scale. Ahead and during the season, various groups predicted, but failed to anticipate, the high amount of activity.
Four of the season's storms became a Category 5 hurricane, the highest ranking on the scale. Emily in July reached peak intensity in the Caribbean Sea, later weakening and striking Mexico twice. In August, Katrina reached peak winds in the Gulf of Mexico but weakened by the time it struck the U.S. states of Louisiana and Mississippi. The most devastating effects of the season were felt on the Gulf Coast of the United States, where Katrina's storm surge crippled New Orleans, Louisiana, for weeks and devastated the Mississippi coastline. Katrina became the costliest U.S. hurricane, leaving $125 billion in damage and 1,833 deaths. Rita followed in September, reaching peak intensity in the Gulf of Mexico before weakening and hitting near the border of Texas and Louisiana. The season's strongest hurricane, Wilma, became the most intense Atlantic hurricane on record, as measured by barometric pressure. Lasting for ten days in October, Wilma moved over Cozumel, the Yucatán peninsula, and Florida, causing $19 billion in damage and 48 deaths.
The season's impact was widespread and catastrophic. Its storms caused an estimated 3,912 deaths and approximately $171.7 billion in damage. It was the costliest season on record at the time, until its record was surpassed 12 years later. It also produced the second-highest accumulated cyclone energy (ACE) in the Atlantic basin, surpassed only by the 1933 season. The season officially began on June 1, 2005, and the first storm – Arlene – developed on June 8. Hurricane Dennis in July inflicted heavy damage to Cuba. Hurricane Stan in October was part of a broader weather system that killed 1,668 people and caused $3.96 billion in damage to eastern Mexico and Central America, with Guatemala hit the hardest. The final storm – Zeta – formed in late December and lasted until January 6, 2006.
|CSU||December 3, 2004||11||6||3|
|TSR||December 10, 2004||9.6||5.7||3.3|
|TSR||January 5, 2005||13.9||7.8||3.6|
|TSR||February 9, 2005||13.6||7.7||3.5|
|TSR||March 7, 2005||14.0||7.9||3.6|
|CSU||April 1, 2005||13||7||3|
|TSR||April 5, 2005||13.9||7.8||3.6|
|InsMet||May 2, 2005||13||7||N/A|
|TSR||May 5, 2005||13.9||7.8||3.6|
|NOAA||May 16, 2005||12–15||7–9||3–5|
|CSU||May 31, 2005||15||8||4|
|TSR||June 7, 2005||13.8||7.8||3.5|
|TSR||July 7, 2005||15.3||8.8||4.1|
|InsMet||August 1, 2005||20||9||N/A|
|NOAA||August 2, 2005||18–21||9–11||5–7|
|TSR||August 5, 2005||22.1||11.4||7.8|
|CSU||August 5, 2005||20||10||6|
|CSU||September 2, 2005||20||10||6|
|CSU||October 3, 2005||20||11||6|
Ahead of the formal start of the season, various groups issued forecasts for the number of named storms, hurricanes, and major hurricanes in the upcoming season, including Colorado State University (CSU), the Cuban Institute of Meteorology (InsMet), Tropical Storm Risk (TSR), and the United States National Oceanic and Atmospheric Administration (NOAA). Some forecasts predicted how many tropical cyclones would affect a particular country or territory.
The first of these forecasts was issued by CSU, which predicted on December 5, 2004 that the season would be above average and feature 11 named storms, 6 hurricanes and 3 intense hurricanes. They also noted that the Caribbean and the entire United States coastline faced an increased risk of a major hurricane making landfall. TSR issued its first forecast a few days later and predicted that the season would feature 9.6 tropical storms, 5.7 hurricanes, 3.3 major hurricanes, and predicted that the accumulated cyclone energy (ACE) rating would be 145.
During January 2005, TSR increased its forecast to 13.9 tropical storms, 7.8 hurricanes, 3.6 major hurricanes, and predicted that the ACE rating would be 157. CSU issued its first updated forecast on April 1, increasing their prediction to 13 tropical storms, 7 hurricanes, and 3 major hurricanes, with a continued risk of a major hurricane landfall in the Caribbean or United States. The increase was based on the Atlantic continuing to warm and a strong belief that El Niño conditions would not persist into the hurricane season. On May 2, the Cuban Institute of Meteorology (InsMet) issued their seasonal forecast, which predicted that the season would feature 13 tropical storms and 7 hurricanes. This was followed on May 16 by NOAA, who predicted a 70% chance of above normal activity, with 12–15 tropical storms, 7–9 hurricanes, and 3–5 major hurricanes. CSU issued its second forecast update on May 31, revising its forecast to 15 named storms, 8 hurricanes and 4 major hurricanes; by this point, the group believed El Niño conditions were unlikely.
In their July forecast update, TSR anticipated that the season would be exceptionally active and well above average; the group increased their forecast to 15.3 tropical storms, 8.8 hurricanes, and 4.1 major hurricanes, with an ACE rating of 190. By the end of July, seven tropical storms and two major hurricanes had developed within the basin, which prompted CSU, InsMet, NOAA and TSR to significantly increase their seasonal forecasts at the start of August. In their August 5 update, CSU predicted that 13 more storms would form, with seven more hurricanes and three more major hurricanes. At the start of September, CSU updated their forecasts and predicted that eight more storms would form, with six more hurricanes and three major hurricanes. By the end of September, 17 named storms had developed, of which nine had developed into hurricanes and four had become major hurricanes. Within their final update for the year, CSU predicted that October would feature three named storms, two hurricanes and one major hurricane.
The 2005 Atlantic hurricane season was the most active Atlantic hurricane season on record. named storms and the unnamed subtropical storm set the record for most storms, surpassing the total of 20 from 1933. A total of 7 named storms formed before August 1, which exceeded the record of 5 set in 1997. The fourth through eleventh and thirteenth through twenty-seventh named storms all developed at record early dates, although Debby in 2012 and Danielle in 2016 have since broken Dennis's record for earliest fourth named storm. Further, the months of July and November set records for number of named storms, with 5 and 3, respectively. The 2005 season featured 15 hurricanes, surpassing the previous record of 12, set in 1969. Of the 15 hurricanes, 5 formed in September, with the season becoming only the sixth to feature 5 in that month. The 2005 season also featured a record seven major hurricanes, one more than the previous record, set in 1926, 1933, 1950, 1996, and 2004. The four Category 5 hurricanes was also a record. The season's activity was reflected with an ACE rating of 250, the second-highest value on record in the Atlantic basin, after the 1933 season.The 27
The extremely active 2005 hurricane season was a continuation of an extended sequence of active years for tropical activity in the Atlantic. 2005 that the conditions associated with this active multi-decadal signal would continue into the 2005 hurricane season, providing favorable conditions for tropical cyclogenesis in the tropical Atlantic.Tropical cyclone activity in the Atlantic Ocean between 1995 and 2004 was more active than any other decade in reliable record. With the exception of two years in which El Niño conditions were prevalent (1997 and 2002), all hurricane seasons were individually above average. This was associated with an active phase of the Atlantic multidecadal oscillation (AMO), with a similar period of elevated tropical activity occurring between 1950 and 1969. The anomalously frequent formation of tropical storms and hurricanes reflected the emergence of unusually warm sea surface temperatures across the tropical Atlantic. The Climate Prediction Center (CPC) predicted in May
Chylek and Lesins (2008) determined that the likelihood of a season generating as much tropical activity as 2005 was less than 1 percent. The consecutive occurrence of hurricane seasons as active as 2004 and 2005 in the Atlantic was unprecedented. While environmental conditions favorable for the development tropical cyclones were analogous to other active seasons, they were more pronounced and encompassed larger areas in 2005. The CPC determined that this environmental enhancement was primarily driven by four factors: the Atlantic multidecadal oscillation, the reduction of atmospheric convection in the tropical Pacific, record-high sea surface temperatures in the tropical Atlantic and Caribbean, and conducive wind and pressure patterns across the western Caribbean and Gulf of Mexico. The multidecadal oscillation increased the potency of conducive environmental factors for tropical development, including the increased strength of subtropical ridges in the northern and southern Atlantic and the eastern Pacific. This amplified the African easterly jet and enhanced upper-level easterlies, attenuating wind shear detrimental to tropical cyclogenesis across the central tropical Atlantic and the Caribbean. Frequent lulls in convection over the tropical Pacific also contributed to the strength of these ridges, focusing hurricane activity in the Atlantic. Most of the tropical storms and all major hurricanes in the Atlantic in 2005 formed when a lack of convection was present near the International Dateline, while a brief uptick in storms near the International Dateline led to a lull in tropical cyclogenesis in the Atlantic for the first half of August.
The Gulf of Mexico saw record levels of tropical activity in 2005, with 11 named storms entering the basin. The unusual activity was attributed to a persistent high pressure area over the Southeastern United States, the northeastward displacement and amplification of the Intertropical Convergence Zone (ITCZ) over the eastern Pacific, and above average sea surface temperatures in the Gulf of Mexico. These factors reduced vertical wind shear and favored cyclonic flow, creating an environment highly supportive of tropical development. The high pressure area also steered incoming storms into the Gulf of Mexico. In addition, the El Niño–Southern Oscillation (ENSO) was in a neutral phase, lowering the likelihood of storms making landfall on the East Coast of the United States and leading to a concentration of impacts farther west. This focusing mechanism led to a complementary reduction in storms developing close to Cape Verde. During the peak of the 2005 season, the Loop Current—an ocean current that transports warm water from the Caribbean Sea northward into the Gulf of Mexico and offshore the U.S. East Coast—propagated northward, reaching its most poleward point in advance of Hurricane Katrina. This protrusion detached into a warm core ring, or a small region of warm waters to an abnormally deep depth, and began to drift southwest as Hurricane Rita traversed the region. By mid-October, the Loop Current returned to its typical position in the Yucatán Peninsula. This evolution provided enhanced ocean heat content to all three hurricanes and was partially responsible for the extreme intensities attained by those cyclones.
In addition to the unusually high amount of tropical activity, the 2005 season also featured an abnormally high amount of storms in the typically inactive early and latter parts of the season. Lowered sea-level atmospheric pressures in the late spring and early summer of 2005 curtailed the strength of tradewinds, resulting in a reduction of latent heat loss from the tropical Atlantic and Caribbean. This allowed the persistence of the anomalously warm sea surface temperatures that had contributed to the active 2004 hurricane season; this warmth remained until November 2005. The activity in later parts of the 2005 season was elevated by the unusual development of four tropical cyclones from non-tropical origins over the eastern Atlantic.
In the wake of the season, questions arose regarding the potential impact of global warming on Atlantic hurricane activity. Hurricane experts noted that establishing a conclusive relationship would be difficult given the significant role that natural variability plays on hurricane formation and significantly improved tropical cyclone detection methods compared to decades past. A series of international workshops were established after 2005. After five years of analysis, researchers were unable to confirm whether the recent increase in tropical cyclone activity could be attributed more to climate change than natural variability. Models developed within the workshops projected that the number of tropical cyclones under Category 3 intensity would fall over the 21st century, while the number of intense Category 4–5 hurricanes would increase significantly. One potential hypothesis for these findings was a projected increase in vertical wind shear contradicted by warmer ocean temperatures for hurricanes to utilize. The team also concluded that the amount of precipitation produced by tropical cyclones would increase over the next century. In May 2020, researchers at the National Oceanic and Atmospheric Administration and the University of Wisconsin at Madison built upon this research and, for the first time, established a statistically significant global trend toward more intense tropical cyclones, particularly in the Atlantic basin. The research not only reaffirmed a trend toward stronger, wetter tropical cyclones, but it also identified a trend toward increased rapid intensification events and a general slowing of tropical cyclones' forward motion near land.
The storms of the season were extraordinarily damaging and were responsible for significant loss of life. Total damage is estimated to be about US$171.7 billion, and the seasons' storms contributed to the deaths of 3,912 people. There were a record 15 storms making landfall, including seven storms that struck the United States.
The hardest-hit area was the United States Gulf Coast from eastern Texas to Florida, affected to varying degrees by Arlene, Cindy, Dennis, Katrina, Ophelia, Rita, Tammy, and Wilma. billion in damage along the Florida Panhandle. Katrina caused catastrophic damage to the Gulf Coast, devastating a long stretch of coast along Louisiana, Mississippi, and Alabama with a 30-foot (9 m) storm surge. Wind damage was reported well inland, slowing down recovery efforts. Storm surge also breached levees in the city of New Orleans, Louisiana, flooding about 80% of the city. Total damage has been estimated at $125 billion, making Katrina the costliest hurricane in U.S. history, surpassing Andrew in 1992 and tying Harvey in 2017. At least 1,836 people were killed by the storm, making it the deadliest hurricane in the U.S. since 1928. Southeastern North Carolina suffered some damage from the slow-moving Ophelia. Rita struck near the border of Louisiana and Texas. The hurricane re-flooded New Orleans (though to a far less degree than Katrina), and caused about $18.5 billion in damage. Wilma caused about $19 billion in damage when it moved across southern Florida in October. The hurricane contributed to 30 deaths, five of whom were killed directly by the storm.Dennis left $2.23
Three hurricanes struck Mexico – Emily, Stan, and Wilma. Emily struck Quintana Roo and Tamaulipas as a major hurricane, million ($3.4 billion MXN) in damage. Stan killed 80 people in Mexico, and damage in the county was estimated at US$1.2 billion ($13.2 billion MXN). Stan was part of a broader weather system across Central America that killed 1,513 people in Guatemala, where damage was estimated at US$996 million. Wilma dropped historic rainfall while drifting across the Yucatán peninsula. It killed four people in the country and left US$454 million ($4.8 billion MXN) in damage.causing US$343
In the Caribbean, Cuba suffered the effects of Dennis and Wilma. The former killed 16 people and left US$1.4 billion in damage when it struck Cuba twice. Later, Wilma flooded parts of western Cuba, leaving US$704 million in damage. The island of Hispaniola experienced Dennis in July, which killed 56 people in Haiti. Emily killed one person and left US$111 million in damage when it struck Grenada, and later it killed five people on Jamaica. Collectively, Dennis and Emily caused about US$96 million (J$6 billion) in damage to Jamaica. Wilma killed 12 people in Haiti and one in Jamaica. Alpha killed 26 people in the Caribbean. In Central America, Beta killed nine people and caused US$11.5 million in damage when it struck Nicaragua in October. In November, Tropical Storm Gamma killed two people in Bequia in the Grenadines, 34 people in Honduras, and 3 in Belize.
Unusual impacts were felt in Europe and nearby islands. The remnants of Maria caused a landslide in Norway that killed three people. people missing.The unnamed subtropical storm in October moved through the Azores. Also in October, Vince became the first recorded tropical cyclone to strike Spain, making landfall at tropical depression intensity. In November, the extratropical remnants of Delta struck the Canary Islands, causing 7 fatalities, with 12
|Tropical storm (SSHWS)|
|Duration||June 8 – June 13|
|Peak intensity||70 mph (110 km/h) (1-min) 989 mbar (hPa)|
The season's first tropical depression developed north of Honduras on June 8 from the interaction of the Intertropical Convergence Zone and a series of tropical waves. A day later it intensified into Tropical Storm Arlene while taking a northward track. On June 10, Arlene struck western Cuba. The storm intensified further in the eastern Gulf of Mexico, reaching winds of 70 mph (110 km/h) early on June 11. Later that day, the storm moved ashore just west of Pensacola, Florida. Over the next two days, Arlene continued northward through the United States, dissipating over southeastern Canada on June 14.
In western Cuba, Arlene produced wind gusts of 49 mph (79 km/h) at Punta del Este and 6.81 in (173 mm) of rainfall in the city of Pinar del Río. Arlene left mostly minor damage throughout the United States, estimated at $11.8 million. Storm surge damaged coastal roads in the Florida Panhandle and Alabama. In Miami Beach, Florida, a student died when she was caught in a rip current. Rainfall in the United States peaked at 9.84 in (250 mm) in Lake Toxaway, North Carolina. The remnants of Arlene dropped approximately 6 to 7 in (150 to 180 mm) of rainfall in Warren County, New York, in just two hours, washing out several roadways and flooding numerous homes.
|Tropical storm (SSHWS)|
|Duration||June 28 – June 30|
|Peak intensity||40 mph (65 km/h) (1-min) 1002 mbar (hPa)|
Between June 24 and June 27, a tropical wave and weak low-pressure area moved in tandem across Central America and eastern Mexico. The system reached the Bay of Campeche early on June 28 and quickly organized into a tropical depression that day around 18:00 UTC. Six hours later, at 00:00 UTC on June 29, the depression intensified into Tropical Storm Bret and peaked with sustained winds of 40 mph (65 km/h). Bret moved ashore northeastern Mexico near Tuxpan, Veracruz, around 12:00 UTC, dissipating early on June 30 over San Luis Potosí.
The cyclone dropped heavy rainfall, reaching at least 10.47 in (266 mm) in El Raudal, Veracruz. One person drowned in Cerro Azul, while another death occurred in Naranjos due to cardiac arrest. The floods forced the evacuation of approximately 2,800 people, :251 damaged around 3,000 houses, isolated 66 villages, and caused about $100 million (MXN, US$9.2 million) in damage.
|Category 1 hurricane (SSHWS)|
|Duration||July 3 – July 7|
|Peak intensity||75 mph (120 km/h) (1-min) 991 mbar (hPa)|
A tropical depression formed on July 3 in the western Caribbean Sea from a tropical wave that moved off Africa nine days prior. The depression crossed the Yucatán Peninsula and dropped rainfall, reaching 2.8 in (71 mm) in Cancún. The system entered the Gulf of Mexico, strengthening into Tropical Storm Cindy early on July 5. Cindy intensified further into a minimal hurricane early on July 6, with peak winds of 75 mph (120 km/h). The hurricane struck southeastern Louisiana and later southern Mississippi. Cindy continued across the southeastern United States and transitioned into an extratropical cyclone on July 7 over The Carolinas; it eventually dissipated over the Gulf of St. Lawrence on July 12.
Across the United States, the hurricane caused $320 million in damage and three fatalities – one in Georgia from flooding, and two in Maryland from a car crash. Across Louisiana, the hurricane left 280,000 people without power. Rainfall in the United States peaked at 9.50 in (241 mm) in Saint Bernard, Louisiana. Cindy spawned a large tornado outbreak, including an F2 tornado near Hampton, Georgia, that caused over $40 million in damage at the Atlanta Motor Speedway alone. The same tornado inflicted severe damage to 11 planes and 5 vintage helicopters at Tara Field and impacted hundreds of homes to some degree.
|Category 4 hurricane (SSHWS)|
|Duration||July 4 – July 13|
|Peak intensity||150 mph (240 km/h) (1-min) 930 mbar (hPa)|
A tropical wave led to the development of Tropical Depression Four in the southeastern Caribbean late on July 4 and further strengthened into Tropical Storm Dennis early the next day. The storm moved west-northwestward, strengthening into a hurricane on July 6 to the south of Hispaniola. On the next day, Dennis rapidly intensified into a Category 4 hurricane while moving between Jamaica and Haiti. Early on July 8, the hurricane briefly moved over Granma Province in southeastern Cuba. After briefly weakening, Dennis restrengthened to attain peak peak winds of 150 mph (240 km/h) in the Gulf of Guacanayabo, making it the strongest Atlantic hurricane before August; its record was broken eight days later by Hurricane Emily. Later on July 8, Dennis moved ashore again in Matanzas Province. The hurricane crossed Cuba entered the Gulf of Mexico on July 9 as a weakened hurricane. Dennis re-intensified to a secondary peak of 145 mph (230 km/h) on July 10, only to weaken prior to its final landfall later that day near Pensacola, Florida. Dennis weakened and moved through the southeastern United States, the Ohio Valley, and eventually dissipating on July 18 over Ontario.
The outer rainbands of Dennis produced widespread flooding and landslides in Haiti, killing at least 56 people and leaving US$50 million in damage. Dennis brought torrential rain to Jamaica, reaching 24.54 in (623 mm) in Mavis Bank. One person died in Jamaica, and damage was estimated at US$31.7 million. The storm's heaviest rainfall occurred in Cuba, reaching 43.0 in (1,092 mm), making Dennis the wettest storm for the island since Hurricane Flora of 1963. Across the island, Dennis killed 16 people, and left US$1.4 billion in damage, affecting agriculture, tourist areas, infrastructure, and houses. Dennis moved ashore Florida near where Hurricane Ivan struck ten months prior. Damage from Dennis in the United States totaled $2.545 billion, and there were 15 deaths in the country, all but one in Florida. Rainfall in the United States reached 12.80 in (325 mm) near Camden, Alabama.
|Category 5 hurricane (SSHWS)|
|Duration||July 11 – July 21|
|Peak intensity||160 mph (260 km/h) (1-min) 929 mbar (hPa)|
On July 11, a tropical wave spawned a tropical depression east of the Lesser Antilles which quickly intensified into Tropical Storm Emily. Moving westward, Emily strengthened into a minimal hurricane and struck Grenada at that intensity on July 14. Continuing across the Caribbean Sea, Emily eventually strengthened into a Category 5 hurricane on July 16 to the southwest of Jamaica, reaching peak winds of 160 mph (260 km/h). Emily broke the record set by Dennis for the strongest Atlantic hurricane before August. Emily weakened after its peak intensity, striking the northeastern Yucatán Peninsula on July 18 with winds of 135 mph (185 km/h). Emily emerged into the Gulf of Mexico and restrengthened, making another landfall in Mexico on July 18 in Tamaulipas with winds of 125 mph (205 km/h). A day later, Emily dissipated over land.
In Grenada, Emily killed one person and caused US$111 million in damage, with thousands of roofs damaged. The hurricane's large circulation also damaged houses in other nearby islands. Heavy rainfall from Emily affected Haiti, killing five people. In Jamaica, Emily produced 15.43 in (392 mm) of rainfall; associated flooding killed five people on the island. Collectively, Emily and earlier Hurricane Dennis left about US$96 million (J$6 billion) in damage to Jamaica. In Honduras, a man drowned in a river swollen by rains from Emily. Damage was heaviest where Emily made its two landfalls in Mexico, with damage in the country estimated at US$343 million ($3.4 billion MXN). Two helicopter pilots were killed when their aircraft crashed while evacuating offshore oil platforms operated by Pemex. A man in Playa del Carmen was electrocuted to death while preparing for the hurricane. The outskirts of Emily dropped heavy rainfall in southern Texas, damaging about $4.7 million worth of cotton.
|Tropical storm (SSHWS)|
|Duration||July 21 – July 29|
|Peak intensity||70 mph (110 km/h) (1-min) 997 mbar (hPa)|
Tropical Depression Six formed northeast of the Bahamas on July 21, originating from a tropical wave that exited the coast of Africa on July 10. The depression quickly intensified into Tropical Storm Franklin, but wind shear disrupted the storm's initial development. As the storm moved to the north and northeast, it intensified; on July 23, Franklin attained peak winds of 70 mph (110 km/h). Three days later the storm passed west of Bermuda. An approaching trough turned Franklin to the northwest and weakened Franklin to a minimal tropical storm. Franklin restrengthened slightly as it accelerated northeastward. On July 30, the storm transitioned into an extratropical cyclone south of Nova Scotia, and a day later it was absorbed by a larger extratropical storm near Newfoundland.
On July 26, Bermuda recorded wind gusts of 37 mph (59 km/h) while the storm made its closest approach. The storm brought light rainfall to Newfoundland.
|Tropical storm (SSHWS)|
|Duration||July 23 – July 25|
|Peak intensity||45 mph (75 km/h) (1-min) 1005 mbar (hPa)|
A tropical wave, the same that spawned Tropical Storm Franklin, moved off Africa on July 10. It tracked west-northwest into the Bay of Campeche on July 23, where it contributed to the development of a tropical depression later that day. As convection increased near the center, the depression intensified into Tropical Storm Gert early on July 24. The cyclone did not persist long over water, instead moving ashore north of Cabo Rojo, Mexico, with 45 mph (75 km/h) winds early on July 25. It continued inland, affecting the same areas impacted by Hurricane Emily just days prior, and quickly dissipated over high terrain at the end of that day. Gert dropped heavy rainfall, reaching 8.46 in (214.9 mm) in San Luis Potosí. Gert caused about US$6 million ($60 million 2005 MXN) in damage, and resulted in one fatality in Nuevo León.
|Tropical storm (SSHWS)|
|Duration||August 2 – August 8|
|Peak intensity||65 mph (100 km/h) (1-min) 994 mbar (hPa)|
Tropical Depression Eight formed on August 2 southwest of Bermuda from a tropical wave that left the African coast on July 22. The depression strengthened into Tropical Storm Harvey on August 3 while moving northeastward. Due to strong wind shear, Harvey initially exhibited subtropical characteristics. On August 4, Harvey passed 45 miles (75 km) south of Bermuda. After moving away from the island, Harvey attained peak winds of 65 mph (100 km/h) late on August 4. Harvey continued northeastward for a few days, transitioning into an extratropical storm on August 9. The storm gradually weakened and eventually dissipated northwest of the Azores on August 14.
On Bermuda, Harvey dropped 5.02 in (128 mm) of rainfall at Bermuda International Airport, flooding some roads. Sustained winds on the island reached 45 mph (75 km/h).
|Category 2 hurricane (SSHWS)|
|Duration||August 4 – August 18|
|Peak intensity||105 mph (165 km/h) (1-min) 970 mbar (hPa)|
A high-latitude tropical wave led to the genesis of Tropical Depression Nine west of Cabo Verde on August 4. It moved to the northwest without much initial development. On August 7, the depression strengthened into Tropical Storm Irene, only to weaken into a tropical depression again the next day. Irene turned to the west, and later resumed its northwest track. It re-intensified into a tropical storm on August 11. On August 15, the storm turned to the north, passing between Bermuda and North Carolina. On the next day, it strengthened into a hurricane. Irene intensified further after turning to the northeast and later east. Late on August 16, the cyclone attained peak winds of 105 mph (165 km/h). An approaching trough weakened Irene and caused it to accelerate northeastward. On August 18, Irene weakened into a tropical storm, and later that day was absorbed by a larger extratropical storm to the southeast of Newfoundland. Rip currents near Long Beach, New York killed a 16-year-old boy.
|Tropical depression (SSHWS)|
|Duration||August 13 – August 14|
|Peak intensity||35 mph (55 km/h) (1-min) 1008 mbar (hPa)|
Tropical Depression Ten formed between the Lesser Antilles and Cabo Verde on August 13 from a tropical wave that entered the Atlantic five days earlier. The depression moved slowly westward in an environment of strong vertical shear. Some weather models predicted relaxing shear and intensification of the system; however, the hostile conditions ripped the system apart, and the NHC discontinued advisories on August 14 when no organized deep convection remained. The remnants of Tropical Depression Ten continued drifting northwestward before degenerating into a tropical wave north of the Leeward Islands. Producing occasional bursts of convection, the mid-level remnant circulation eventually merged with another system. This new system would become Tropical Depression Twelve over the Bahamas and, eventually, Hurricane Katrina.
|Tropical storm (SSHWS)|
|Duration||August 22 – August 23|
|Peak intensity||60 mph (95 km/h) (1-min) 998 mbar (hPa)|
A tropical wave, plausibly the same that spawned Tropical Depression Ten nine days earlier, led to the formation of Tropical Depression Eleven over the Bay of Campeche on August 22. The depression strengthened into Tropical Storm Jose later that day and achieved a maximum strength of 60 mph (95 km/h). Jose made landfall in the Mexican state of Veracruz near the Laguna Verde Nuclear Power Station on August 23. The cyclone became more organized two hours before making landfall and was forming an eye, but its winds remained under hurricane strength. Jose rapidly weakened and soon dissipated as it moved inland over Mexico.
While drenching Mexico's Gulf coast, Jose forced some 25,000 residents from their homes in Veracruz state and damaged at least 16,000 homes in the state. Jose killed 11 people in Veracruz and 5 in Oaxaca. Damage in Mexico totaled roughly $45 million.
|Category 5 hurricane (SSHWS)|
|Duration||August 23 – August 30|
|Peak intensity||175 mph (280 km/h) (1-min) 902 mbar (hPa)|
A tropical depression developed on August 23 from the complex interaction of a tropical wave, the mid-level remnants of Tropical Depression Ten, and a nearby upper-level trough. The depression became a tropical storm on August 24 and a hurricane on August 25, making landfall as a Category 1 hurricane in southeastern Florida. Katrina imparted about $500 million in crop and infrastructure damage to the state. The hurricane quickly crossed Florida and emerged into the Gulf of Mexico. Katrina rapidly intensified to Category 5 status early on August 28, becoming the fourth most intense recorded hurricane in the Atlantic basin. Turning northward, the hurricane weakened as it approached the northern gulf coast. On August 29 at 11:10 UTC, Katrina made landfall in southeastern Louisiana as a Category 3 hurricane, with 125 mph (200 km/h) winds, and a barometric pressure of 920 mbar (27 inHg); it was the third lowest pressure for a landfalling United States hurricane at the time, and fourth as of 2018. Katrina then crossed the Breton Sound, making a third and final landfall with 120 mph (190 km/h) winds near Pearlington, Mississippi. The cyclone quickly weakened after moving inland and became extratropical over Kentucky on August 30.
On August 27, the New Orleans National Weather Service issued an urgent weather bulletin describing potentially catastrophic impacts, comparing Katrina to Hurricane Camille of 1969. A day later, New Orleans mayor Ray Nagin issued the city's first-ever mandatory evacuation. About 80% of the city and 83% of neighboring Jefferson Parish evacuated ahead of the storm. The hurricane left catastrophic damage across southern Louisiana, with more than 300,000 houses damaged or destroyed; most of these were in Orleans Parish. In New Orleans, storm surge breached the levees along the Gulf Intracoastal Waterway and 17th Street and London Avenue Canals, flooding about 80% of the city. Portions of the city remained underwater for 43 days. The hurricane also damaged or destroyed 30 oil platforms, and forced the nine oil refineries to shut down for a few weeks. There were 575 spills of hazardous chemicals related to Katrina. The Mississippi and Alabama coastlines also suffered catastrophic damage from the storm's 30 ft (9 m) storm surge, with very few structures remaining on the coast of the former. Across the region, the hurricane flooded and ruined about 350,000 vehicles. About 2.4 million people lost access to clean drinking water. Katrina also spawned an outbreak of 62 tornadoes across the eight states in the eastern United States.
Hurricane Katrina imparted catastrophic damage in portions of Louisiana and Mississippi, with overall damage estimated at $125 billion; this makes Katrina the costliest natural disaster in U.S. history, tied with Hurricane Harvey in 2017. Throughout the United States, Katrina killed 1,833 people, making it one of the deadliest hurricanes in the United States, and the deadliest American hurricane since 1928. The Federal Emergency Management Agency (FEMA) managed the aftermath of the hurricane, which faced criticism for its response time, lack of coordination with state agencies, supply shortages, and insufficient housing for federal workers. Tens of thousands of people lost their jobs following the hurricane. Residents across the New Orleans area suffered health effects, including rashes and respiratory problems, from polluted water and air following the hurricane. Katrina forced about 800,000 people to move temporarily, which was the greatest number of displaced people in the country since the Dust Bowl. The United States federal government spent $110.6 billion in relief, recovery and rebuilding efforts, including $16 billion toward rebuilding houses, which was the nation's largest ever housing recovery project. Within a year of the storm, most of the levees were largely repaired. Various countries and international agencies sent supplies or financial aid to assist in the hurricane response.
|Tropical storm (SSHWS)|
|Duration||August 28 – September 2|
|Peak intensity||40 mph (65 km/h) (1-min) 1006 mbar (hPa)|
A tropical wave moved off the coast of Africa on August 24. It developed into Tropical Depression Thirteen on August 28 while 960 miles (1550 km) east of the Lesser Antilles. Strong wind shear prevented much organization, and the depression degenerated into a low pressure area late on August 29. The remnants moved to the north and northeast, steered by a larger non-tropical system to the north. The convection increased on August 31; that day the system regenerated into a tropical depression, which strengthened further into Tropical Storm Lee. The storm attained peak winds of 40 mph (65 km/h) while located between Bermuda and the Azores. After 12 hours as a tropical storm, Lee weakened back to a tropical depression as it turned to the northwest, steered by the larger non-tropical storm. On September 2, the depression degenerated into a remnant low, which was absorbed by a cold front two days later.
|Category 3 hurricane (SSHWS)|
|Duration||September 1 – September 10|
|Peak intensity||115 mph (185 km/h) (1-min) 962 mbar (hPa)|
A strong tropical wave entered the eastern Atlantic on August 27. The broad disturbance was initially hindered by strong wind shear but eventually organized into a tropical depression about halfway between the Leeward Islands and Cabo Verde early on September 1. The tropical cyclone moved northwest and steadily organized as upper-level winds became more conducive. It strengthened into Tropical Storm Maria on September 2 and eventually became the fifth hurricane of the season early on September 4. As the cyclone developed a well-defined eye, Maria reached peak winds of 115 mph (185 km/h), Category 3 strength, early on September 6. Around the time of its peak, Maria turned to the north and northeast, moving around the subtropical ridge as it gradually weakened. Maria fell to tropical storm intensity on September 9 and became extratropical a day later between Newfoundland and the Azores. The former hurricane re-intensified over the northern Atlantic Ocean, only to weaken before passing near southern Iceland. On September 14, the extratropical storm that was once Maria merged with another extratropical storm while approaching Norway. The remnants of Maria brought heavy rainfall to Norway, triggering a landslide in Bergen that killed three people and injured seven others.
|Category 1 hurricane (SSHWS)|
|Duration||September 5 – September 10|
|Peak intensity||90 mph (150 km/h) (1-min) 979 mbar (hPa)|
A tropical wave left Africa on August 30 and moved into the southwestern Atlantic, where subsequent interaction with an upper-level low led to the genesis of a tropical depression south-southwest of Bermuda on September 5. This depression quickly intensified into Tropical Storm Nate, which moved slowly northeastward. On September 7, Nate intensified into the sixth hurricane of the season. A day later, the hurricane passed southeast of Bermuda, where it produced wind gusts of 50 mph (80 km/h). Early on September 9, Nate attained peak winds of 90 mph (150 km/h) as it accelerated northeastward ahead of a trough. The same trough created unfavorable conditions, causing Nate to weaken quickly back to tropical storm status. On September 10, Nate transitioned into an extratropical storm which was absorbed by a larger extratropical storm near the Azores on September 13.
Canadian Navy ships headed to the U.S. Gulf Coast to help in the aftermath of Hurricane Katrina were slowed down trying to avoid Nate and Ophelia.Rip currents caused by hurricanes Nate and Maria killed one person in New Jersey, and severely injured another person.
|Category 1 hurricane (SSHWS)|
|Duration||September 6 – September 17|
|Peak intensity||85 mph (140 km/h) (1-min) 976 mbar (hPa)|
The interplay of a cold front and a trough led to the development of Tropical Depression Sixteen over the northern Bahamas on September 6. The depression strengthened into Tropical Storm Ophelia on September 7 and briefly into a hurricane on September 9 while stalled off the east coast of Florida. Ophelia fluctuated between hurricane and tropical storm intensity for the next week as it meandered off the southeastern United States. Twice it attained peak winds of 85 mph (140 km/h). On September 14, the northern eyewall moved over the North Carolina coast from Wilmington to Morehead City. After moving away from the state, Ophelia weakened to tropical storm status for a fourth and final time due to stronger wind shear and dry air. The storm accelerated northeastward and passed southeast of Cape Cod. Ophelia transitioned into an extratropical storm on September 18 and subsequently crossed Nova Scotia and Newfoundland, eventually dissipating on September 23 north of the Scandinavian Peninsula.
Ophelia caused significant coastal erosion from the churning waves. The hurricane caused extensive damage in the Outer Banks and around Cape Fear. Damage in the United States was estimated at $70 million. The storm's remnants produced strong winds and heavy rain over Atlantic Canada. Ophelia killed three people – a drowning in Florida from high surf, a traffic fatality in North Carolina, and a death from a fall in Nova Scotia.
|Category 1 hurricane (SSHWS)|
|Duration||September 17 – September 23|
|Peak intensity||80 mph (130 km/h) (1-min) 985 mbar (hPa)|
On September 17, Tropical Depression Seventeen formed from a tropical wave about 350 miles (560 km) east of Barbados. It quickly intensified into Tropical Storm Philippe while taking a track to the north-northwest. Early on September 19, Philippe attained hurricane status and reached peak winds of 80 mph (130 km/h) a day later. Wind shear from an upper-level low caused the hurricane to weaken back to a tropical storm, exposing the center from the convection. On September 21, Philippe accelerated to the north and began moving around the upper-level low, which had extended to the surface and developed into a non-tropical cyclone. The storm briefly threatened Bermuda as it turned to the northwest and began a counterclockwise loop. On September 23, Philippe weakened to a tropical depression and later a remnant low; it was absorbed by the larger non-tropical cyclone a day later.
Philippe brought gusty winds and moisture to Bermuda, with 0.15 inches (3.8 mm) of precipitation reported on September 23. The circulation that absorbed Philippe dropped light rainfall on the island, and was responsible for the lowest barometric pressure during the month.
|Category 5 hurricane (SSHWS)|
|Duration||September 18 – September 26|
|Peak intensity||180 mph (285 km/h) (1-min) 895 mbar (hPa)|
In mid-September, the southern extent of a stationary front devolved into a trough north of the Leeward Islands. A tropical wave interacted with this feature to form a tropical depression near the Turks and Caicos Islands on September 18. It organized into Tropical Storm Rita later that day. Moving to the west-northwest, the storm's intensification attenuated over the Bahamas before resuming thereafter, becoming a hurricane on September 20 between Cuba and Florida. Rapid intensification ensued as Rita moved into the Gulf of Mexico. Late on September 21, Rita strengthened into a Category 5 hurricane, and the next day it attained peak winds of 180 mph (285 km/h). Its minimum pressure of 895 mbar (hPa; 26.43 inHg) was the lowest of any storm in the Gulf of Mexico on record. The hurricane weakened as it approached the northwest Gulf Coast. On September 24, Rita made landfall near the Texas–Louisiana border with sustained winds of 115 mph (185 km/h). It rapidly weakened over land as it turned to the north and northeast, and was later absorbed absorbed by an approaching cold front on September 26 over Illinois.
Across the United States, Rita imparted $18.5 billion in damage and killed 120 people, although only seven deaths were directly related to the hurricane. Early in its evolution, Rita flooded houses in northern Cuba and the Florida Keys. Rita's approach to the U.S. Gulf Coast prompted one of the largest mass evacuations in the country's history, with an estimated 3.7 million people fleeing the Texas coast between Corpus Christi and Beaumont. Due in part to high temperatures preceding Rita's landfall and elderly susceptibility to excessive heat, at least 80 people died during the mass evacuation; a coach fire en route to Dallas claimed 23 lives. Rita generated a 15-foot (4.6 m) storm surge that devastated parts of Cameron Parish in Louisiana, destroying most structures in towns like Cameron and Holly Beach. Storm surge also damaged homes in adjoining Jefferson County in Texas. In New Orleans, Rita produced additional flooding and overtopped levees that had been repaired after Hurricane Katrina a month earlier. Impacts from heavy rainfall, gusty winds, and tornadoes associated with Rita affected much of the lower Mississippi River Valley, and over a million electricity customers lost power.
A third of Cameron Parish's population left the parish following the devastation wrought by Rita. percent decrease in offshore oil production in the Gulf of Mexico. FEMA granted over $1.3 billion to Louisiana to support recovery efforts; $668.8 million was allocated in the form of public assistance grants for initial recovery measures, and $523.5 million was sent to individuals as part of the agency's Individuals and Households program. Over $1 billion in federal assistance was also disbursed to Texas. Texas' Community Development Block Grant Disaster Recovery Program aided 1.85 million people in addition to supporting longer-term infrastructure repairs.Hurricanes Katrina and Rita had the combined effect of causing a 19
|Tropical depression (SSHWS)|
|Duration||September 30 – October 2|
|Peak intensity||35 mph (55 km/h) (1-min) 1006 mbar (hPa)|
On September 30, a tropical wave developed into Tropical Depression Nineteen to the west of Cabo Verde. The newly-formed cyclone exhibited deep convection in the southern semicircle, but its cloud pattern quickly deteriorated under the influence of strong wind shear. The system moved northwestward and failed to intensify beyond winds of 35 mph (55 km/h), instead dissipating on October 2 without affecting land.
|Category 1 hurricane (SSHWS)|
|Duration||October 1 – October 5|
|Peak intensity||80 mph (130 km/h) (1-min) 977 mbar (hPa)|
A tropical wave emerged from Africa on September 17 and moved across the central Atlantic, hampered by north-northeasterly wind shear. The disturbance eventually traveled into the western Caribbean Sea, where it organized into a tropical depression southeast of Cozumel around 12:00 UTC on October 1. High pressure directed the cyclone toward the west-northwest, and the depression intensified into Tropical Storm Stan shortly before making landfall along the eastern coast of the Yucatan Peninsula. Stan briefly weakened to a tropical depression as it crossed over land, but it regained tropical storm strength over the Bay of Campeche on October 3, when ridging further intensified and forced the storm west-southwest. Rapid intensification ensued, allowing Stan to become a Category 1 hurricane before its second landfall east-southeast of Veracruz early on October 4. Once inland, the system rapidly unraveled over the mountainous terrain of Mexico, dissipating in the state of Oaxaca just after 06:00 UTC on October 5.
Stan killed 80 people in Mexico, and damage in the county was estimated at US$1.2 billion ($13.2 billion MXN). Stan was associated with a larger weather system across eastern Mexico and Central America. Torrential rainfall across this region killed 1,513 people in Guatemala, making it the deadliest natural disaster in the country's history. Damage in Guatemala was estimated at US$996 million. El Salvador's Santa Ana Volcano erupted on October 1, occurring simultaneous to the flooding. The flooding killed 69 people in the country, and damage from the two disasters was estimated at US$355.6 million. In Honduras, the weather system killed seven people and left US$100 million in damage. There were also three deaths in Nicaragua and one in Costa Rica. Road damage in Costa Rica from Stan and earlier Hurricane Rita was estimated at US$57 million (₡28 billion (CRC).
|Subtropical storm (SSHWS)|
|Duration||October 4 – October 5|
|Peak intensity||50 mph (85 km/h) (1-min) 997 mbar (hPa)|
In the post-season analysis, the National Hurricane Center identified an additional subtropical storm that had gone unclassified during the course of the season. In late September, an upper-level low formed west of the Canary Islands and moved westward, organizing into a subtropical depression early on October 4. It quickly intensified into a subtropical storm while curving northeast ahead of an approaching cold front. The storm attained peak winds of 50 mph (85 km/h) as it moved through the eastern Azores, where Santa Maria Island reported sustained winds up to 40 mph (60 km/h). Early on October 5, the storm merged with the cold front; later that day, its remains were absorbed by a non-tropical low. The low that absorbed the storm would eventually become Hurricane Vince.
|Tropical storm (SSHWS)|
|Duration||October 5 – October 6|
|Peak intensity||50 mph (85 km/h) (1-min) 1001 mbar (hPa)|
On October 5, Tropical Storm Tammy developed east of Florida following the interaction of a tropical wave and an upper-level trough. That day, it strengthened to reach peak winds of 50 mph (85 km/h) and made landfall near Jacksonville, Florida. Tammy weakened as it moved inland, crossing southern Georgia and Alabama. It was absorbed by a larger extratropical storm on October 6. Tammy dropped locally heavy rainfall along its path, causing minor damage. The frontal system that absorbed Tammy was a partial cause for severe flooding in New York, New Jersey and New England that killed 10 people in mid-October.
|Subtropical depression (SSHWS)|
|Duration||October 8 – October 10|
|Peak intensity||35 mph (55 km/h) (1-min) 1008 mbar (hPa)|
Subtropical Depression Twenty-Two formed from a non-tropical low 450 miles (725 km) southeast of Bermuda on October 8. The system encountered unfavorable conditions as it turned westward and degenerated into a remnant low on October 10, before becoming extratropical on the following day. The NHC continued to monitor the remnant as it headed towards the East Coast of the United States. The extratropical system transported tropical moisture northward, and was, along with Tropical Storm Tammy, a partial cause of severe flooding in New York, New Jersey and New England during early-to-mid-October. The flooding killed 10 people after 6 to 10 in (150 to 250 mm) of precipitation fell in some locales.
|Category 1 hurricane (SSHWS)|
|Duration||October 8 – October 11|
|Peak intensity||75 mph (120 km/h) (1-min) 988 mbar (hPa)|
Subtropical Storm Vince formed in the eastern Atlantic near Madeira on October 8 from the same non-tropical low that absorbed the unnamed subtropical storm. Vince transitioned into a tropical storm on the following day and was upgraded to a hurricane shortly thereafter. Although Vince was a very small and short-lived storm that only briefly reached hurricane strength, it was notable for developing in the northeastern Atlantic, well away from where hurricanes are usually form. Vince made landfall on the Iberian Peninsula near Huelva, Spain, on October 11 just after weakening to a tropical depression. Vince was the first tropical cyclone on record to make landfall in Spain. The storm left minor flooding in some areas.
|Category 5 hurricane (SSHWS)|
|Duration||October 15 – October 25|
|Peak intensity||185 mph (295 km/h) (1-min) 882 mbar (hPa)|
An upper-level low over the southwestern Atlantic helped facilitate the formation of a large, monsoon-like gyre over the Caribbean Sea in middle October. A series of tropical waves moved into this area of disturbed weather and helped from a low-pressure system that developed into Tropical Depression Twenty-Four southwest of Jamaica on October 15. It intensified into Tropical Storm Wilma two days later. Wilma moved slowly through the warm waters of the western Caribbean Sea and began a period of rapid deepening on October 18 that lasted into the following day. This culminated in the cyclone attaining Category 5 hurricane status, reaching peak winds of 185 mph (295 km/h) and setting a record for the lowest barometric pressure in an Atlantic hurricane; at 12:00 UTC on October 19, the Hurricane Hunters recorded a pressure of 882 mbar (26.0 inHg) in the center of the tiny, well-defined eye of Wilma. Wilma weakened to Category 4 intensity by the time it made landfall on Cozumel on October 21. It later crossed the northeastern Yucatán Peninsula and emerged into the Gulf of Mexico, turning northeast. On October 24, Wilma made landfall in southwestern Florida at Cape Romano with winds of 120 mph (190 km/h). The hurricane quickly crossed the state and continued across the western Atlantic Ocean. Wilma transitioned into an extratropical cyclone on October 26, which was absorbed by a larger extratropical storm a day later over Atlantic Canada.
In its formative stages, Wilma's large circulation spread across much of the western Caribbean Sea, killing 12 people in Haiti and one in Jamaica. Wilma set a record in Mexico, and for the entire Western Hemisphere, for the highest 24 hour rainfall total, with 64.330 in (1,633.98 mm) recorded at Isla Mujeres. There were four deaths in Mexico, and nationwide damage was estimated at US$454 million ($4.8 billion MXN). Local and federal troops quelled looting and rioting in Cancún. Cancún's airport was closed to the public in the days after the storm, forcing stranded visitors to fly out of Mérida, Yucatán, the region's closest functioning airport. On November 28, Mexico declared a disaster area for 9 of Quintana Roo's 11 municipalities. Mexico's development bank – Nacional Financiera – provided financial assistance for businesses affected by Wilma and Stan through a $400 million fund (MXN, US$38 million).
A significant storm surge flooded areas of western Cuba, leaving US$704 million in damage. In Florida, Wilma caused $19 billion in damage and killed 30 people; five of the deaths were caused directly by the hurricane. Wilma's storm surge caused the worst flooding in the Florida Keys since Hurricane Betsy in 1965. Wilma inflicted a multi-billion dollar disaster in the Miami metropolitan area, including $2.9 billion in damage in Palm Beach County, $2 billion in Miami-Dade County, and $1.2 billion in Broward County. Numerous homes and businesses experienced some degree of impact, with over 55,000 dwellings and 3,600 workplaces damaged in Palm Beach County alone. On October 24, 2005, the same day Wilma made landfall in Florida, President George W. Bush approved a disaster declaration for 13 Florida counties. The Federal Emergency Management Agency (FEMA) expended $342.5 million to the 227,321 approved applicants. Additionally, public assistance from FEMA totaled over $1.4 billion and grants for hazard mitigation projects exceeded $141.5 million. After leaving Florida, Wilma killed one person and left US$6.4 million in damage to the Bahamas, when it passed northwest of the country. On Bermuda, Hurricane Wilma produced wind gusts of 51 mph (81 km/h).
|Tropical storm (SSHWS)|
|Duration||October 22 – October 24|
|Peak intensity||50 mph (85 km/h) (1-min) 998 mbar (hPa)|
A tropical wave organized into Tropical Depression Twenty-Five in the eastern Caribbean on October 22. Later that day, the depression strengthened into Tropical Storm Alpha as it moved west-northwestward. Around 10:00 UTC on October 23, Alpha made landfall near Barahona, Dominican Republic, with winds of 50 mph (85 km/h). Alpha weakened to a tropical depression over Hispaniola's steep mountains. The cyclone emerged into the Atlantic Ocean, where it was absorbed by Hurricane Wilma on October 24. Alpha was the 22nd named system in the 2005 Atlantic hurricane season, breaking the 1933 season's record and becoming the first tropical storm to be named using the Greek Alphabet. The storm claimed 26 lives, with more than half of them in Haiti. Alpha destroyed 43 homes and damaged 191 others in Haiti.
|Category 3 hurricane (SSHWS)|
|Duration||October 26 – October 31|
|Peak intensity||115 mph (185 km/h) (1-min) 962 mbar (hPa)|
Late on October 26, the same tropical wave that spawned Tropical Storm Alpha led to the formation of Tropical Depression Twenty-Six over the southwestern Caribbean Sea. Early the next day, it was upgraded to Tropical Storm Beta. The storm strengthened into a hurricane on October 29 and reached major hurricane intensity on October 30, with sustained winds around 115 mph (185 km/h). That brought the total number of major hurricanes in the 2005 season to seven, a record breaking achievement. However, Beta weakened to a Category 2 prior to landfall in Nicaragua. The storm rapidly weakened inland and dissipated on October 31.
The Colombian island of Providencia was subjected to hurricane-force winds for several hours as the center of the storm moved very slowly by the island. Reports indicate extensive damage to homes and a loss of communications with the islanders. structures were damaged by the storm, hundreds of which were destroyed. Overall, Beta caused nine fatalities and more than $15.5 million in damage across four countries.In Honduras and Nicaragua, over 1,000
|Tropical storm (SSHWS)|
|Duration||November 14 – November 21|
|Peak intensity||50 mph (85 km/h) (1-min) 1002 mbar (hPa)|
Late on November 13, Tropical Depression Twenty-Seven formed from a tropical wave about 115 mi (185 km) west-southwest of St. Lucia. While passing through the Lesser Antilles, the heavy rainfall caused mudslides, killing two people on Bequia. The cyclone briefly attained tropical storm status, but wind shear prevented further development of the system, and advisories were discontinued on November 16 as it lost its closed circulation about 305 mi (490 km) southeast of Kingston, Jamaica. The remnants of the depression continued westward and moved along the northern shore of Honduras, merging with parts of a larger low pressure system. It is uncertain whether the remnants of Gamma absorbed the low pressure system or vice versa. The storm strengthened and a closed circulation formed on November 18, making Gamma a tropical storm for the second time. After regeneration, and after making landfall over northern Honduras, floods from Gamma killed 34 people in Honduras. Three people died in Belize related to the storm. Gamma meandered in the Caribbean Sea for a short time, until slowly weakening and eventually disintegrating into a remnant low late on November 20. The storm caused 39 deaths in total.
|Tropical storm (SSHWS)|
|Duration||November 22 – November 28|
|Peak intensity||70 mph (110 km/h) (1-min) 980 mbar (hPa)|
Delta originated from a broad and non-tropical low-pressure area that arose 1,380 miles (2,220 km) southwest of the Azores on November 19, initially moving northeast along the trailing fringes of a passing cold front. Convection developed atop the center of the nascent disturbance two days later, and satellite data suggested that it was acquiring thermodynamic characteristics exhibited by tropical cyclones. On November 22, the NHC classified the low-pressure system as a subtropical storm with the name Delta. Delta took a south-southwestward course and further coalesced its associated showers, leading to its re-designation as a tropical storm on November 23. It stalled 1,320 miles (2,130 km) west-southwest of the Canary Islands and attained peak winds of 70 mph (110 km/h) on November 24. Delta moved erratically over the next two days and weakened to a low-end tropical storm in response to increasing wind shear. A strengthening trough over western Europe accelerated Delta towards the east-northeast on November 27, concurrent with the brief emergence of an eye and a period of intensification. Delta's tropical characteristics later succumbed to wind shear and cold air, resulting in its extratropical transition on November 28 while 250 miles (400 mi) west-northwest of the western Canary Islands; as an extratropical system, Delta tracked east, passing north of the Canary Islands before moving into Morocco and Algeria on November 29, where it dissipated.
Delta caused severe damage in the Canary Islands and claimed at least seven lives, including six who drowned after boats overturned; there were 12 people missing from the overturned boat. El Dedo de Dios, a geological feature which had been pointing towards the sky for over a millennium and an important landmark for the Canary Islands, was toppled during the storm. Damage throughout the Canary Islands was estimated at €312 million ($364 million 2005 US dollars). Delta also caused power outages, leaving some 200,000 people without power and forcing airports to close down. The remnants of Delta later moved into Morocco, bringing needed rain.
|Category 1 hurricane (SSHWS)|
|Duration||November 29 – December 8|
|Peak intensity||85 mph (140 km/h) (1-min) 981 mbar (hPa)|
A surface low attached to a stationary front formed underneath an upper-level low east of Bermuda on November 27. The surface low detached from the frontal zone and acquired tropical characteristics as deep convection wrapped around its center, leading to the development of Tropical Storm Epsilon early on November 29. The NHC consistently forecast that the storm would weaken; however, Epsilon gradually intensified as it moved westward and later looped to the northeast. The storm attained hurricane status on December 2 as the track shifted to the east. Epsilon attained peak winds of 85 mph (140 km/h) on December 5, maintaining its intensity due to low wind shear. A ridge turned Epsilon to the southwest on December 6. Epsilon lasted as a hurricane until December 7, the most for any Atlantic tropical cyclone in December. Epsilon degenerated into a remnant low on December 8; the circulation dissipated two days later.
|Tropical storm (SSHWS)|
|Duration||December 30 – January 6|
|Peak intensity||65 mph (100 km/h) (1-min) 994 mbar (hPa)|
Towards the end of December, an upper-level low interacted with a cold front, which produced an area of low-pressure by December 28, about 750 mi (1,205 km) to the west-northwest of Cabo Verde. Over the next couple of days, the system developed a low-level circulation and atmospheric convection increased as it moved north-westwards, before the NHC classified it as Tropical Storm Zeta during December 30. As a result, Zeta became the second latest-forming tropical cyclone, in the Atlantic on record behind Alice of December 1954. Over the next couple of days, the system gradually intensified further in a region of favorable anticyclonic outflow, as it slowly moved west-northwest in response to a mid-level low to the southwest. During January 1, Zeta became only the second tropical storm on record to exist in two calendar years, while it peaked with 1-minute sustained winds of 65 mph (100 km/h). It weakened on January 2, only to re-intensify to its peak intensity on January 3. Zeta weakened again as it turned westward, degenerating into a remnant low on January 6; the circulation dissipated on the next day to the southeast of Bermuda. Zeta affected the 2005 Atlantic Rowing Race by producing high swells that moved boats off course.
Names used for tropical storms and hurricanes that formed in the North Atlantic in 2005 were:
This was the same list used for the 1999 season, with the exceptions of Franklin and Lee, which replaced Floyd and Lenny. season was exhausted. The 2005 season was the first season to trigger this naming protocol.The names not retired from this list were used again in the 2011 Atlantic hurricane season. Fifteen names were used within the Atlantic for the first time in 2005: Franklin, Lee, Maria, Nate, Ophelia, Philippe, Rita, Stan, Tammy, Vince, Wilma, Beta, Gamma, Epsilon and Zeta. In accordance with the naming policy of the World Meteorological Organization, storms were sequentially assigned Greek letter names after the naming list provisioned for the 2005
After the season had ended, the World Meteorological Organization's hurricane committee retired five names: Dennis, Katrina, Rita, Stan and Wilma and replaced them with Don, Katia, Rina, Sean and Whitney for the 2011 season.This surpassed the previous record for the number of hurricane names retired after a single season, four (held by the 1955, 1995, 2004 and 2017 seasons). During the conference, there was considerable discussion on the usage of the Greek alphabet and if those names could be retired if one proved to be particularly damaging or deadly. The committee decided that the usage of the Greek alphabet had a major important political, economic and social impact globally, which might not have happened if a secondary or circular list of names had been used. As a result, the committee decided that the Greek alphabet would be used again if the traditional naming list was exhausted, and that it was not practical to retire a Greek letter.
A table of the storms that formed during the 2005 Atlantic hurricane season is given below: it includes storm name, duration, peak strength, areas affected, damage, and death total. Damage and deaths include amounts while the storm was extratropical, a wave, or a low. The death toll includes all indirect deaths, such as traffic accidents or electrocutions. Damage figures are in 2005 USD.
|Dates active||Storm category |
at peak intensity
|Arlene||June 8–13||Tropical storm||70 (110)||989||Cayman Islands, Cuba, Southeast United States||$11.8 million||1|
|Bret||June 28–30||Tropical storm||40 (65)||1002||Central Mexico||$9.2 million||2|
|Cindy||July 3–7||Category 1 hurricane||75 (120)||991||Yucatan Peninsula, Southeastern US, East Coast of the United States||$320 million||3|
|Dennis||July 4–13||Category 4 hurricane||150 (240)||930||Windward Islands, Greater Antilles, Southeastern US, Great Lakes Region||$4.026 billion||88|
|Emily||July 11–21||Category 5 hurricane||160 (260)||929||Lesser Antilles, Greater Antilles, South America, Yucatan Peninsula, Mexico, Texas||$458.7 million||17|
|Franklin||July 21–29||Tropical storm||70 (110)||997||Bahamas, Bermuda, Newfoundland||None||None|
|Gert||July 23–25||Tropical storm||45 (75)||1005||Central Mexico||$6 million||1|
|Harvey||August 2–8||Tropical storm||65 (100)||994||Bermuda||None||None|
|Irene||August 4–18||Category 2 hurricane||105 (165)||970||East Coast of the US||None||1|
|Ten||August 13–14||Tropical depression||35 (55)||1008||None||None||None|
|Jose||August 22–23||Tropical storm||60 (95)||998||Central Mexico||$45 million||16|
|Katrina||August 23–30||Category 5 hurricane||175 (280)||902||Bahamas, South Florida, Cuba, Southeastern US, Eastern US||$125 billion||1,836|
|Lee||August 28 – September 2||Tropical storm||40 (65)||1006||None||None||None|
|Maria||September 1–10||Category 3 hurricane||115 (185)||962||Iceland, Scotland||$3.1 million||3|
|Nate||September 5–10||Category 1 hurricane||90 (150)||979||Bermuda, Azores||None||1|
|Ophelia||September 6–17||Category 1 hurricane||85 (140)||976||Bahamas, Florida, The Carolinas, East Coast of the US, Atlantic Canada, Europe||$70 million||3|
|Philippe||September 17–23||Category 1 hurricane||80 (130)||985||Bermuda||Minimal||None|
|Rita||September 18–26||Category 5 hurricane||180 (285)||895||Hispaniola, Bahamas, Cuba, Florida, Gulf Coast of the United States, Midwestern United States||$18.5 billion||120|
|Nineteen||September 30 – October 2||Tropical depression||35 (55)||1006||None||None||None|
|Stan||October 1–5||Category 1 hurricane||80 (130)||977||Central America, Mexico||$2.708 billion||1,669|
|Unnamed||October 4–5||Subtropical storm||50 (85)||997||Azores||None||None|
|Tammy||October 5–6||Tropical storm||50 (85)||1001||Bahamas, Southeastern US||Minor||10|
|Twenty-Two||October 8–10||Subtropical depression||35 (55)||1008||Bermuda, New England||Minimal|
|Vince||October 8–11||Category 1 hurricane||75 (120)||988||Portugal, Spain||Minimal||None|
|Wilma||October 15–26||Category 5 hurricane||185 (295)||882||Bahamas, Jamaica, Central America, Yucatan Peninsula, Cuba, South Florida, Bahamas, Atlantic Canada||$20.2 billion||48|
|Alpha||October 22–24||Tropical storm||50 (85)||998||Hispaniola, Bahamas||Unknown||26|
|Beta||October 26–31||Category 3 hurricane||115 (185)||962||Central America, Colombia||$15.5 million||9|
|Gamma||November 14–21||Tropical storm||50 (85)||1002||Lesser Antilles, Central America||$18 million||39|
|Delta||November 22–28||Tropical storm||70 (110)||980||Canary Islands, North Africa||$364 million||19|
|Epsilon||November 29 – December 8||Category 1 hurricane||85 (140)||981||None||None||None|
|Zeta||December 30 – January 6||Tropical storm||65 (100)||994||None||None||None|
|31 systems||June 8, 2005 – January 6, 2006||185 (295)||882||$171.755 billion||3,912|
The 1997 Atlantic hurricane season was a below-average season and is the most recent season to feature no tropical cyclones in August – typically one of the most active months. The season officially began on June 1, and lasted until November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. The 1997 season was inactive, with only seven named storms forming, with an additional tropical depression and an unnumbered subtropical storm. It was the first time since the 1961 season that there were no active tropical cyclones in the Atlantic basin during the entire month of August. A strong El Niño is credited with reducing the number of storms in the Atlantic, while increasing the number of storms in the Eastern and Western Pacific basin to 19 and 29 storms, respectively. As is common in El Niño years, tropical cyclogenesis was suppressed in the tropical latitudes, with only two becoming tropical storms south of 25°N.
The 1981 Atlantic hurricane season was a fairly active season that featured 22 tropical depressions and twelve storms. The season officially began on June 1, 1981, and lasted until November 30, 1981. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. Almost all of the named storms made landfall. Cindy, Harvey, and Irene did not affect land, either directly or indirectly.
The 1990 Atlantic hurricane season was the most active Atlantic hurricane season since 1969, with a total of 14 named storms. The season also featured eight hurricanes, one of which intensified into a major hurricane. It officially began on June 1, 1990, and lasted until November 30, 1990. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. However, tropical cyclogenesis can occur prior to the start of the season, as demonstrated with Tropical Depression One, which formed in the Caribbean Sea on May 24.
The 2006 Atlantic hurricane season was the least active since 1997 as well as the first season since 2001 in which no hurricanes made landfall in the United States, and was the first since 1994 in which no tropical cyclones formed during October. Following the intense activity of 2005, forecasters predicted that the 2006 season would be only slightly less active. Instead activity was slowed by a rapidly forming moderate El Niño event, the presence of the Saharan Air Layer over the tropical Atlantic, and the steady presence of a robust secondary high-pressure area to the Azores high centered on Bermuda. There were no tropical cyclones after October 2.
The 1920 Atlantic hurricane season featured tropical storms and hurricanes only in the month of September. Although no "hurricane season" was defined at the time, the present-day delineation of such is June 1 to November 30. The first system, a hurricane, developed on September 7 while the last, a tropical depression, transitioned into an extratropical cyclone on October 27. Of note, four of the six cyclones co-existed with another tropical cyclone during the season.
The 1997 Pacific hurricane season was a very active hurricane season. With hundreds of deaths and hundreds of millions of dollars in damage, this season was one of the costliest and deadliest Pacific hurricane seasons. This was due to the exceptionally strong 1997–98 El Niño event. The 1997 Pacific hurricane season officially started on May 15, 1997, in the eastern Pacific, and on June 1, 1997, in the central Pacific, and lasted until November 30, 1997. These dates conventionally delimit the period of each year when almost all tropical cyclones form in the northeastern Pacific Ocean.
The 2007 Atlantic hurricane season was a slightly above-average Atlantic hurricane season, featuring many weak and short-lived storms. Despite the high activity of weak storms during 2007, it was the first season to feature more than one Category 5 landfalling hurricane, a feat that would not be matched until ten years later. It produced 17 tropical cyclones, 15 tropical storms, six hurricanes, and two major hurricanes. It officially started on June 1 and ended on November 30, dates which conventionally delimit the period during which most tropical cyclones form in the Atlantic Ocean, although as shown by Subtropical Storm Andrea and Tropical Storm Olga in early May and early December, respectively, the formation of tropical cyclones is possible at any time of the year. The first system, Subtropical Storm Andrea, developed on May 9, while the last storm, Tropical Storm Olga, dissipated on December 13. The most intense hurricane, Dean, is tied for the eighth most intense Atlantic hurricane ever recorded as well as the third most intense Atlantic hurricane at landfall. The season was one of only seven on record for the Atlantic with more than one Category 5 hurricane. It was the second on record in which an Atlantic hurricane, Felix, and an eastern Pacific hurricane, Henriette, made landfall on the same day. September had a record-tying eight storms, although the strengths and durations of most of the storms were low. Aside from hurricanes Dean and Felix, none of the storms in the season exceeded Category 1 intensity.
The 2008 Atlantic hurricane season was the most disastrous Atlantic hurricane season since 2005, causing over 1,000 deaths and nearly $50 billion in damage. The season ranked as the third costliest ever at the time, but has since fallen to sixth costliest. It was an above-average season, featuring sixteen named storms, eight of which became hurricanes, and five which further became major hurricanes. It officially started on June 1 and ended on November 30. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. However, the formation of Tropical Storm Arthur caused the season to start one day early. It was the only year on record in which a major hurricane existed in every month from July through November in the North Atlantic. Bertha became the longest-lived July tropical cyclone on record for the basin, the first of several long-lived systems during 2008.
Hurricane Stan was a relatively weak but deadly tropical cyclone that affected areas of Central America in early October 2005. The eighteenth named storm and eleventh hurricane of the 2005 Atlantic hurricane season, Stan formed from a tropical wave on October 1 after it had moved into the western Caribbean Sea. The depression slowly intensified, and reached tropical storm intensity the following day, before subsequently making its first landfall on the Yucatán Peninsula. Traversing the peninsula, the tropical storm weakened, but was able to re-intensify once it entered the Bay of Campeche. Under favorable conditions for tropical development, Stan attained hurricane strength on October 4, and later reached peak intensity with winds of 80 mph (130 km/h) and a minimum barometric pressure of 977 mbar. The hurricane maintained this intensity until landfall near Punta Roca Partida, Mexico later the same day. Once over the mountainous terrain of Mexico, however, Stan quickly weakened, and dissipated on October 5.
The Timeline of the 2005 Atlantic hurricane season documents the formations, strengthenings, weakenings, landfalls, extratropical transitions, and dissipations of the season's tropical and subtropical storms. The 2005 Atlantic hurricane season was the most active Atlantic hurricane season in recorded history. The season saw a record twenty-eight tropical or subtropical storms of which a record four storms achieved Category 5 status. Officially beginning on June 1, 2005, and lasting until November 30, the 2005 season persisted into January 2006 due to continued storm activity.
Hurricane Wilma was the most intense tropical cyclone ever recorded in the Atlantic basin, and the second-most intense tropical cyclone recorded in the Western Hemisphere, after Hurricane Patricia in 2015. Part of the record-breaking 2005 Atlantic hurricane season, which included three of the ten most intense Atlantic hurricanes ever, Wilma was the twenty-second storm, thirteenth hurricane, sixth major hurricane, fourth Category 5 hurricane, and the second-most destructive hurricane of the 2005 season. A tropical depression formed in the Caribbean Sea near Jamaica on October 15, headed westward, and intensified into a tropical storm two days later, which abruptly turned southward and was named Wilma. Wilma continued to strengthen, and eventually became a hurricane on October 18. Shortly thereafter, explosive intensification occurred, and in only 24 hours, Wilma became a Category 5 hurricane with wind speeds of 185 mph (298 km/h).
The 1975 Pacific hurricane season officially started May 15, 1975, in the eastern Pacific, and June 1, 1975, in the central Pacific, and lasted until November 30, 1975. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeast Pacific Ocean.
Hurricane Katrina was an extremely destructive Category 5 hurricane that affected the majority of the Gulf Coast. Its damaging trek began on August 23, 2005, when it originated as Tropical Depression Twelve near the Bahamas. The next day, the tropical depression strengthened to a tropical storm, and was named Katrina; it proceeded to make landfall on the southern tip of the U.S. state of Florida as a minimal hurricane.
Hurricane Wilma was the most intense tropical cyclone in the Atlantic basin on record, with an atmospheric pressure of 882 hPa. Wilma's destructive journey began in the second week of October 2005. A large area of disturbed weather developed across much of the Caribbean Sea and gradually organized to the southeast of Jamaica. By late on October 15, the system was sufficiently organized for the National Hurricane Center to designate it as Tropical Depression Twenty-Four.
The effects of Hurricane Katrina in Florida were in both in the southern portion of the state and in the panhandle. After developing on August 23, Katrina made landfall near the border of Broward and Miami-Dade counties with 80 mph (130 km/h) winds on August 25. While it was crossing the state, the hurricane's convection was asymmetrical, primarily located to the south and east of the center. As a result, high rainfall totals occurred in the Miami area, peaking at 16.43 in (417 mm) in Perrine. The rains caused flooding, and the combination of rains and winds downed trees and power lines, leaving 1.45 million people without power. Damage in South Florida was estimated at $523 million (2005 USD), mostly as a result of crop damage. Further south, the hurricane spawned a tornado in the Florida Keys. In the island chain, Katrina dropped heavy rainfall and gusty winds.
The 2012 Atlantic hurricane season was the final year in a consecutive string of three very active seasons, although many of the storms were weak and short-lived. It is tied with 1887, 1995, 2010, and 2011 for having the third-most named storms on record. It was also the third-costliest season, behind 2005 and 2017. The season officially began on June 1 and ended on November 30, dates that conventionally delimit the period during each year in which most tropical cyclones form in the Atlantic Ocean. However, Alberto, the first system of the year, developed on May 19 – the earliest date of formation since Tropical Storm Ana in 2003. A second tropical cyclone, Beryl, developed later that month. This was the first occurrence of two pre-season named storms in the Atlantic basin since 1951. It moved ashore in North Florida on May 29 with winds of 65 mph (100 km/h), making it the strongest pre-season storm to make landfall in the Atlantic basin. This season marked the first time since 2009 where no tropical cyclones formed in July. Another record was set by Hurricane Nadine later in the season; the system became the fourth-longest-lived tropical cyclone ever recorded in the Atlantic, with a total duration of 22.25 days. The final storm to form, Tony, dissipated on October 25 – however, Hurricane Sandy, which formed before Tony, became extratropical on October 29.
The 2016 Atlantic hurricane season was the first above-average hurricane season since 2012, producing 15 named storms, 7 hurricanes and 4 major hurricanes. The season officially started on June 1 and ended on November 30, though the first storm, Hurricane Alex which formed in the Northeastern Atlantic, developed on January 12, being the first hurricane to develop in January since 1938. The final storm, Otto, crossed into the Eastern Pacific on November 25, a few days before the official end. Following Alex, Tropical Storm Bonnie brought flooding to South Carolina and portions of North Carolina. Tropical Storm Colin in early June brought minor flooding and wind damage to parts of the Southeastern United States, especially Florida. Hurricane Earl left 94 fatalities in the Dominican Republic and Mexico, 81 of which occurred in the latter. In early September, Hurricane Hermine, the first hurricane to make landfall in Florida since Hurricane Wilma in 2005, brought extensive coastal flooding damage especially to the Forgotten and Nature coasts of Florida. Hermine was responsible for five fatalities and about $550 million (2016 USD) in damage.
The 2017 Atlantic hurricane season was the costliest tropical cyclone season on record, with a damage total of at least $294.92 billion (USD). It was also a hyperactive Atlantic hurricane season, featuring 17 named storms, 10 hurricanes, and 6 major hurricanes, making the season the fifth-most active Atlantic hurricane season on record, tied with 1936. Most of the season's damage was due to hurricanes Harvey, Irma, and Maria. Another notable hurricane, Nate, was the worst natural disaster in Costa Rican history. The names Harvey, Irma, Maria, and Nate were retired following the season due to the number of deaths and amount of damage they caused. Collectively, the tropical cyclones were responsible for at least 3,364 deaths—the most fatalities in a single season since 2005. The season also had the highest accumulated cyclone energy (ACE) since 2005, with a record three hurricanes each generating an ACE of over 40: Irma, Jose, and Maria.
The 2018 Atlantic hurricane season was the third in a consecutive series of above-average and damaging Atlantic hurricane seasons, featuring 15 named storms, 8 hurricanes, and 2 major hurricanes, which caused a total of over $50 billion in damages and least 172 deaths. The season officially began on June 1, 2018, and ended on November 30, 2018. These dates historically describe the period each year when most tropical cyclones form in the Atlantic basin and are adopted by convention. However, the formation of Tropical Storm Alberto on May 25 marked the fourth consecutive year in which a storm developed before the official start of the season. The season concluded with Oscar transitioning into an extratropical cyclone on October 31, almost a month before the official end.
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