The 1996 Pacific hurricane season had below normal tropical cyclone activity, producing 9 tropical storms, of which 5 became hurricanes, with 2 of those intensifying into major hurricanes. With an Accumulated cyclone energy (ACE) index of 53.9, the season ranks among the least intense Pacific hurricane seasons on record. It officially began May 15, 1996, in the eastern north Pacific and on June 1, 1996, in the central north Pacific. It ended on November 30, 1996. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific Ocean.[1] The season slightly exceeded these bounds when tropical storm One-E formed on May 13.
Much of the season's activity was clustered near the coast of Southwest Mexico, with four hurricanes and one tropical storm making landfall along it. The most impactful were: Hurricane Alma, which was responsible for 20 deaths, and Hurricane Fausto, which left behind damage amounting to around $800,000 (1996 USD). Hurricane Douglas was the strongest storm of the season, reaching Category4 intensity on the Saffir-Simpson Hurricane Scale. Douglas developed in the Caribbean Sea, within the Atlantic basin, as Hurricane Cesar, before crossing into the Pacific as a tropical storm.
The season officially began on May15 in Eastern Pacific and on June1 in Central Pacific; both ended on November30.[3] This season was below average in activity. In the eastern north Pacific, eleven tropical cyclones formed. Of these, four became hurricanes, one of which were major hurricanes because they reached Category3 or higher on the Saffir-Simpson Hurricane Scale. The remainder were tropical storms.[4] In addition, one Atlantic hurricane, Cesar, crossed into the Pacific as a tropical storm, at which time it was renamed Douglas.[5] None of the systems in the eastern north Pacific crossed 140°W into the central Pacific. The last time that happened was in the 1979 season.[6]
In the central Pacific, one tropical depression formed. In addition, a depression crossed the dateline from the western Pacific before dissipating in this basin. Neither of these systems reached tropical storm strength.[7] In addition, data from the Joint Typhoon Warning Center, on September1 Tropical Depression Rick crossed the International Dateline, entering into CPHC's area of responsibility;[8] however, this storm was not included into CPHC database. The storm eventually became extratropical on September3 over open waters.
In terms of the number of storms, the season was below average. Despite this, there were a large number of landfalls. Of note is the fact that three tropical cyclones approached close to, or made landfall on, Mexico during a ten-day span from June 23 to July 3.[9] In all, a record-setting four hurricanes (Alma, Boris, Fausto, and Hernan) struck the coastline.[10]
The Accumulated Cyclone Energy (ACE) index for the 1996 Pacific hurricane season (Eastern Pacific and Central Pacific combined) as calculated by Colorado State University using data from the National Hurricane Center was 53.9units,[nb 1][11] making this season a below-normal season. It is one of the lowest totals ever recorded, with only the 1977, 2010 and 2007 seasons having a lower ACE.
The season had an early start on May 13 when a tropical wave in the open ocean organized into Tropical Depression One-E. The depression moved west-northwest and strengthened into a tropical storm on May 14. On that day, the tropical storm reached its peak intensity, with maximum sustained winds at 50mph (80km/h) and a minimum central pressure of 1,000hPa (29.53inHg).[12]Wind shear steadily weakened the cyclone until it dissipated early on May 17. This system was the only tropical storm to form in May during the period from 1992 to 1999.[13]
This storm was not assigned a name because it was determined to be a tropical storm after the season was over.[12] The storm was initially forecast to become a tropical storm, but information available at the time did not warrant the upgrade.[14] Subsequently, wind reports relayed from the US Coast Guard to the National Hurricane Center suggested that this cyclone was a tropical storm.[12]
This tropical cyclone impacted two ships. The first— called the True Blue — was near the fringes of the storm and escaped. The other— the trimaranSolar Wind — provided wind observations until communications with the vessel were lost after 0600 UTC on May 14. Despite a search by the US Coast Guard, the ship and its two-person crew were never found.[12]
On May 15 an area of disturbed weather in the Intertropical Convergence Zone developed into a tropical depression. The disturbance was not readily traceable back to a tropical wave from the Atlantic. On its first day of its existence, Tropical Depression Two-E was a well-organized system with maximum sustained winds of 35mph (56km/h) and a minimum central pressure of 1,006mbar (29.7inHg).[15] As it slowly moved west, Two-E experienced a few intermittent bursts of convection. However, the depression gradually became less organized during the remainder of its life. On May 18, the cyclone's organization deteriorated markedly until it dissipated the next morning.
Tropical Depression Two-E never threatened land. Consequently, there were no reports of deaths or damage.[15]
On June 20, the southern part of the same tropical wave that spawned Tropical Storm Arthur in the Atlantic overcame shear to strengthen into Tropical Depression Three-E. It reached tropical storm intensity that same day. When the shear relaxed, Alma strengthened into a hurricane. Weak steering currents sent Alma towards the Mexican coast. It made landfall near Lázaro Cárdenas, Michoacán, on June 23 and almost immediately went back out to sea. Alma slowly paralleled the coast as the topography disrupted the cyclone's circulation. Alma weakened to tropical storm intensity on June 24 and to tropical depression intensity on June 26. It dissipated the next day. Alma's maximum winds were 105mph (165km/h) and Alma's minimum pressure was 969mbar (28.6inHg).[16]
Hurricane Alma was the first of three consecutive storms to come close to, or make landfall on, the Pacific coast of Mexico during a ten-day span. At least three, and possibly twenty, people were killed. Three were killed when a house near Lázaro Cárdenas collapsed. There were unconfirmed reports that 17people were killed by floods in the state of Puebla caused by Alma's rains. Trees were downed and power was knocked out to many places. Roads were flooded and covered with debris throughout the affected area.[16]
On June 27, a tropical wave developed convection and became Tropical Depression Four. It moved north and slowly intensified. The rate of intensification increased and the depression became a tropical storm on June 28. Boris reached hurricane intensity on June 28 and peaked with winds of 90mph (150km/h) and a central pressure of 979mbar (28.9inHg).[17] Boris then made landfall on June 29 about midway between Lázaro Cárdenas and Acapulco. Boris then moved offshore after turning to the southwest and dissipated on July 1 while south of Puerto Vallarta.[17]
Hurricane Boris was, in general, a well-forecast storm. Due to the short time when the system was at or above tropical storm intensity, long-range forecasts were not verified. The average errors were 116mi (187km) at one and a half days in the future.[17] Boris caused at least five deaths. One person was killed in Tecpan. Nearby, three other people drowned and five fishers were missing. In Acapulco, a child was killed when a roof collapsed.[17] Rain was heavy throughout the impacted region, with the highest totals in Guerrero.[17] The highest total was 14.98in (380mm) at Paso de San Antonio, to the east of the point of landfall.[18]
On July 1, a tropical wave organized into Tropical Depression Five-E.[9] The location of the depression was the easternmost since the depression that eventually became Hurricane Paul in the 1982 season.[19] Five-E strengthened into Tropical Storm Cristina on July 2 as it continued its west-northwest track. Cristina was almost a hurricane at the time of its landfall near Puerto Ángel on July 3. It peak strength, which occurred at landfall, was 70mph (110km/h) and 991mbar (29.3inHg). Cristina dissipated over the mountains of Mexico on July 3.[9]
As a whole, both Cristina's intensity and track were well-forecast. However, the tropical cyclone's short life made verification of a small number of forecasts limited.[9] When Cristina was approaching, the Mexican government issued a tropical storm warning for the coast between Tapachula and Punta Maldonado on July 2.[9]
Tropical Storm Cristina killed one person, a fisherman, who was aboard a boat caught at sea. Another person from that boat was missing, and a third individual was rescued. Eleven other fishing boats, with a total of twenty-two people aboard, were missing. Their fate is unknown.[9] The National Hurricane Center received no reports of damage due to Tropical Storm Cristina; however, there was flooding due to storm surge and damage from wind. It also produced rain.[9]
On July 4, a persistent area of thunderstorms organized into a tropical depression. Weak steering currents slowly moved it northwest.[20] Easterly wind shear inhibited the development of the system.[21] Despite the wind shear, Six-E was forecast to strengthen into a tropical storm,[22] but it instead weakened to a swirl of clouds and advisories were ended on July 5.[23] Tropical Depression Six-E dissipated on July 6. At its peak strength, Six-E had winds of 35mph (56km/h) and a central pressure of 1,003mbar (29.6inHg).[24]
This cyclone never came ashore. Consequently, no reports of damage or deaths were received by the National Hurricane Center.[24]
Hurricane Douglas was a continuation of Atlantic Hurricane Cesar, which crossed Central America. Continuing Cesar's nearly due-west heading, it was still a tropical storm when it entered the Pacific on July 29, and quickly regained hurricane status.[5]
Douglas strengthened over the next two days as it turned west-northwest, paralleling the coast of Mexico. It reached its peak intensity on August 1, with winds of 130mph (215km/h) and a central pressure of 946mbar (27.9inHg), making it the strongest hurricane of the season at a Category 4 strength.[5] It slow weakening began on August 2 as it entered cooler waters, and it officially dissipated on August 6, though like many Pacific hurricanes, a remnant circulation could be tracked westward for several days afterward.[5]
Compared with the long-term average, Hurricane Douglas was a well-forecast storm.[5] The cyclone passed close enough to Mexico to necessitate a tropical storm warning starting on July 29 for the coast from Salina Cruz to Acapulco, with a watch along a further section of coast. The watches and warnings were discontinued on July 30.[5]
Hurricane Douglas brought up to 6in (150mm) of rain on the south coast of Mexico and resulted in a 4-ft (1.2-m) storm surge.[25] No deaths or damages were attributed to the Douglas portion of Hurricane Cesar-Douglas.[5]
A tropical depression, which formed on August 13, from a cutoff area of low pressure area, crossed the dateline on August 14. It continued to head east, passing close to Midway Island. It dissipated on August 14, although the remnants of the system hung around the area for a few more days. At its strongest in the central north Pacific, Tropical Depression Seventeen-W had winds of 35mph (56km/h) and a pressure of 1,000mbar (30inHg).[7][26]
Seventeen-W brought light winds, with gusts reaching gale-force, to Midway Island. It also brought about 2.5in (63.5mm) of rain. After the cyclone dissipated, showers and gusty winds continued to occur on Midway and Kure for a few more days.[7]
After making landfall along the Bay of Campeche coast north of Tuxpan, Veracruz, Hurricane Dolly managed to maintain its tropical characteristics while crossing the Mexican Plateau, and entered the eastern Pacific as a tropical depression late on August 24. Though the system entered the eastern Pacific intact, the National Hurricane Center did not re-classify it as an eastern Pacific tropical depression, nor were any coastal advisories issued. No re-intensification occurred after the system entered the eastern Pacific, and it dissipated early the following day, just west of San Juanito in the Islas Marías.[27]
A tropical wave organized into Tropical Depression Eight-E on August 30. The cyclone paralleled the coast of Mexico and also gradually decelerated. Despite some wind shear, Eight-E strengthened into a tropical storm on September 2 and was named Elida. On September 3 and 4, Elida came close to the southern tip of the Baja California Peninsula at its peak intensity of 994mbar (29.4inHg) and winds of 65mph (100km/h). The cyclone then drifted into cooler waters, was devoid of deep convection on September 5, and dissipated the next day.[28]
The storm was forecast slightly better than the long-term averages for the eastern North Pacific.[28] Elida posed enough of a threat to the Baja California Peninsula to require a tropical storm warning for the Baja California Peninsula south of Cabo San Lázaro on September 3. The warning was lifted on September 5 after the threat ended.[28] Moderate to heavy rains fell in association with the tropical cyclone across southwest Mexico and the Baja California Peninsula, with the maxima falling at San Marcos/Compostela in southwest mainland Mexico, which measured 6.60in (168mm), and a maximum for Baja California of 3.88in (99mm) at La Poza Honda/Comondu.[29] While passing offshore, the tropical storm killed six people and affected 1,200 others,[30] but Elida caused no known damage.[28]
The precursor disturbance to Fausto was first noticed over Venezuela as early as August 31, and may have been related to the tropical wave that spawned Hurricane Fran.[31] By September 4 the wave had crossed Central America into the Pacific; it steadily organized until it was upgraded to Tropical Storm Fausto on September 10.[31]
Fausto intensified rapidly after it reached hurricane intensity on the September 12, peaking with sustained winds of 105 knots (194km/h) and a minimum central pressure of 955mb.[31] The hurricane weakened as an approaching trough increased shear over the storm; this same trough also turned the storm north on the September 13, where it made landfall as a minimal hurricane on Baja California that day.[31] On September 14, the storm turned northeastward across the Gulf of California, and dissipated inland over the Sierra Madre range after its second landfall as a hurricane.[31] Its extratropical remnants flared up briefly over northern Mexico and the U.S. state of Texas, but otherwise soon lost their identity.
Heavy rainfall was accompanied with the passage of this cyclone, with a storm total of 18.50inches (470mm) reported at San Vicente de la Sierra.[32] Damage in Mexico was relatively minor, with only a single casualty caused by a downed power line.[31] Damage totaled to around $800,000 (1996USD).[33]
Tropical Depression One-C
Tropical depression(SSHWS)
Duration
September 15– September 20
Peak intensity
35mph (55km/h) (1-min);
A tropical disturbance organized into a tropical depression on September 15. It headed west until September 17. That day, it turned to the west for two days before heading back west-northwest on September 19. It soon began to weaken and dissipated the next day. At its most intense, Tropical Depression One-C had winds of 35mph (55km/h) and unknown pressure.[6]
The tropical cyclone caused no known impact and never came near land.[6]
In the Gulf of Tehuantepec, an area of disturbed weather containing convection formed on September 23. It moved westward without incident until September 27, when it developed stronger convection and became Tropical Depression Ten-E. Immediately thereafter, it strengthened into a tropical storm and was named Genevieve while it continued its westward track.[34]
Genevieve slowly got better organized, and reached its peak intensity of 999mbar (29.5inHg) and 50mph (85km/h) on September 29.[34] The tropical storm then turned to the west-southwest as steering currents collapsed. The cyclone began a time of erratic motion, which included two loops. The erratic motion also exposed Genevieve to wind shear, and the tropical storm weakened to a tropical depression on October 1. On October 6, the shear temporarily weakened, and Tropical Depression Genevieve restrengthened into a tropical storm. The cyclone's wandering continued, and it entrained dry air. This dry air weakened the system to a depression for a second time on October 8, and Genevieve dissipated the next day. Brief flare-ups of convection could still be seen for a few days thereafter.[34]
Tropical Storm Genevieve was a rather poorly forecast storm. Most tropical cyclone prediction models indicated a northwesterly track that never happened, and also over-intensified the system.[34] In addition, advisories on Tropical Depression Genevieve were discontinued on October 3, and only resumed three days later. Later analysis determined that Genevieve had been a tropical depression for this whole time.[34]
Tropical Storm Genevieve never came near land, and consequently no watches or warnings were required for any location. The tropical cyclone had no impact on any land.[34]
On September30, a tropical wave organized into Tropical Depression Eleven-E. Gradual strengthening ensued, and the depression strengthened into a tropical storm twelve hours later and was named Hernan.[35] Hernan's initial track was to the west, but the system gradually started to recurve. Its center of circulation reformed, and Hernan briefly turned to the northwest again. By October2, and Hernan was close to the coast. It strengthened into a hurricane that day. Late on October2 and early on October3 Hernan closely paralleled the coast. Interaction with land weakened the cyclone, and when Hernan made landfall on October3 near Barra de Navidad, Jalisco, it was only a minimal hurricane. Land weakened the cyclone, and by the time it emerged into the ocean north of Puerto Vallarta, it was so disorganized that it dissipated on October5. At its strongest, Hurricane Hernan had winds of 85mph (140km/h) and a central pressure of 980mbar (29inHg).[35]
The National Hurricane Center forecasts on the hurricane were generally forecast slightly worse than the "average" system. Errors by tropical cyclone prediction models were attributed mainly to Hernan's recurvature. In terms of intensity, this system was correctly predicted to become a hurricane although advisories underforecast its eventual intensity.[35]
For the coast from Acapulco to Manzanillo, a tropical storm warning was issued on October1. A hurricane watch was issued from Zihuatanejo to Manzanillo on October2. It was upgraded to a warning later that day. Also on October2, the coast from Manzanillo to San Blas was placed under a tropical storm warning. Meanwhile, the hurricane warning was extended to Cabo Corrientes. On October3, the hurricane warning was extended to San Blas and the tropical storm warning was extended to Mazatlán.[35]
Because it made landfall in a sparsely populated area, Hernan killed no one. Around 1,000homes were damaged or destroyed and 100people were injured. Flooding occurred in Melaque, Jalisco. Flooding also caused washed-out roads along Federal Highways 200 and 80. In many areas, telephone service was interrupted and power outages occurred. Along the coasts of Colima and Jalisco, waves caused by Hernan reached 13ft (3.9m) in height.[35]
A system acquired enough convection and became organized enough to be considered a tropical depression on November 7.[36] Although the environment was initially favourable and the system was almost upgraded into a tropical storm as was forecast,[37] wind shear kept the cyclone weak. Its convection was eventually destroyed and advisories were ended on November 10.[38] Twelve-E dissipated on November 11 and no deaths or damages were reported.[39]
The following list of names was used for named storms that formed in the North Pacific Ocean east of 140°W in 1996.[40] This is the same list used for the 1990 season,[41] except for Winnie, which had been interchanged with Wallis. No names were retired following the season, and so it was used again for the 2002 season.[42][43]
For storms that form in the North Pacific from 140°W to the International Date Line, the names come from a series of four rotating lists. Names are used one after the other without regard to year, and when the bottom of one list is reached, the next named storm receives the name at the top of the next list.[40][42] No named storms formed in or crossed into the area in 1996.[7]
Season effects
This is a table of all of the storms that formed in the 1996 Pacific hurricane season. It includes their name, duration (within the basin), peak classification and intensities, areas affected, damage, and death totals. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but were still related to that storm. Damage and deaths include totals while the storm was extratropical, a wave, or a low, and all of the damage figures are in 1996 USD.
↑ The total represents the sum of the squares of the maximum sustained wind speed (knots) for every (sub)tropical storm's intensity of over 33knots (38mph, 61km/h), divided by 10,000 while they are above that threshold; therefore, tropical depressions are not included.
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References
↑ Dorst Neal. "When is hurricane season?". Atlantic Oceanographic and Meteorological Laboratory. Archived from the original on 6 December 2010. Retrieved November 25, 2010.
↑ Neal Dorst (June 2, 2016). "TCFAQ G1) When is hurricane season?". Atlantic Oceanographic and Meteorological Laboratory. Archived from the original on 2009-05-06. Retrieved July 24, 2018.
1 2 National Hurricane Operations Plan(PDF) (Report). Washington, D.C.: NOAA Office of the Federal Coordinator for Meteorological Services and Supporting Research. May 1996. pp.3-8–9. Retrieved February 1, 2024.
↑ National Hurricane Operations Plan(PDF) (Report). Washington, D.C.: NOAA Office of the Federal Coordinator for Meteorological Services and Supporting Research. May 1990. p.3-7. Retrieved February 1, 2024.
1 2 "Tropical Cyclone Names". Miami, Florida: National Hurricane Center. July 23, 2002. Archived from the original on October 1, 2002. Retrieved February 1, 2024.
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