Hurricane Hilda

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Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

The origins of Hilda can be definitively traced back to a tropical wave that trekked across the western Caribbean Sea during the last week of September. [3] However, a loosely defined mass of clouds east of the Lesser Antilles on September 23 was potentially associated with the formation of Hilda. Tracking westward, the area of convection gradually intensified, with hints at a well-defined circulation as the system tracked over Haiti on September 27. [3] [2] By 1200 UTC on September 28, [1] the disturbance had become sufficiently defined to be classified as a tropical depression south of Cuba. Tracking generally westward, [3] the depression crossed Cape San Antonio, Cuba on September 29, intensifying to tropical storm strength in the meanwhile before moving into the northern Yucatán Channel. Favorable conditions for tropical cyclone development in the western Caribbean, including the presence of abnormally high sea surface temperatures, allowed for the further strengthening of Hilda. [2]

Hilda's crossing of western Cuba slightly disrupted the intensification of the tropical cyclone, but strengthening resumed shortly thereafter. [2] Upon reaching the Gulf of Mexico later of September 29, Hilda began to track very slowly at an average speed of 9 mph (14 km/h), [3] later meeting the threshold of hurricane intensity at 1200 UTC on September 30. [1] During that time, atmospheric conditions over the Gulf of Mexico rapidly improved; a preexisting belt of strong wind shear, which would have inhibited further cyclonic strengthening, disintegrated coincident with Hilda's passage of the gulf. [2] Rapid intensification ensued on October 1, and by 0600 UTC that day Hilda became a major hurricane. [1] [nb 2] Twelve hours later, the hurricane reached its peak intensity with maximum sustained winds of 150 mph (240 km/h) and a minimum barometric pressure of 941  mbar (hPa; 27.79  inHg) based on reconnaissance flights. [2] [1] During this phase the storm was centered roughly 350 mi (560 km) south of New Orleans, Louisiana. [3] Around the same time, an abnormally strong trough centered over Mississippi began to sharply curve the forward motion of Hilda towards the north. [5]

TIROS VIII image of Hilda near Louisiana on October 2 Hurricane Hilda.JPG
TIROS VIII image of Hilda near Louisiana on October 2

Following peak intensity, further strengthening was inhibited due to the emergence of a high pressure area over the United States Gulf Coast. The presence of this system injected dry air into Hilda, gradually weakening the hurricane. The once prominent eye of the storm clouded over as a result of this advection. [6] During the evening hours of October 3, [3] around 23:00 UTC, Hilda made landfall on the central Louisiana coast near Calumet with a minimum pressure of 959 mbar (hPa; 28.32 inHg) and maximum sustained winds of 105 mph (165 km/h), making a Category 2 hurricane on the modern-day Saffir–Simpson hurricane wind scale. [7] [8] Rapid weakening followed landfall as a result of the surrounding cold air; [6] by 0600 UTC on October 4, Hilda had been downgraded to tropical storm intensity. [1] The same area of high pressure which had weakened the tropical cyclone later forced Hilda eastward, [5] [6] resulting in the storm's merging with a cold front and thus transitioning into an extratropical cyclone later that day. [6] [1] These extratropical remnants continued to track eastward before they were last noted near Jacksonville, Florida on October 5. [9]

Preparations

The first hurricane watches or warnings issued by the Weather Bureau in association with Hilda were issued on October 1, when the agency issued a hurricane watch for the coast of Louisiana to Mobile, Alabama. This prompted the Texas Department of Public Safety to issue a standby alert for the Texas coast. [10] On October 3, the Weather Bureau upgraded the watch to a hurricane warning, and expanded it to include the entire Texas Coastal Bend eastward to Mobile, Alabama. [11] As Hilda neared the coast, the scope of the warning was narrowed to include only areas of the Louisiana Gulf Coast eastward to Mobile, Alabama and a gale warning for an extent of the United States Gulf Coast from Mobile Bay to Panama City, Florida. [12] By the afternoon of October 4, hurricane warnings were lowered but gale warnings remained in place. [13]

Evacuation of offshore oil platforms began as early as September 29. The majority of the 2,000 oil workers were evacuated on September 30 and October 1. [14] Along the United States Gulf Coast, approximately 150,000 people evacuated. [15] The U.S. Office of Civil Defense and three companies of the Louisiana National Guard were assigned to areas of the coast expedite the evacuation process. [16] Areas lining Lake Pontchartrain were almost entirely evacuated. [15] Re-purposed boxcars were used to move 3,400 evacuees northward from New Orleans and Franklin, Louisiana. [16] A mandatory evacuation order was placed for a 23 mi (37 km) section of the coast of St. Mary Parish, Louisiana, with shuttle buses assisting in evacuating refugees to Opelousas, Louisiana. The United States Red Cross transported 10,000 cots to evacuation centers in Opelousas to serve the evacuees. [17] Morgan City and Cameron, Louisiana were sites of mass exodus with Hilda approaching the coast. [11] Evacuation out of Cameron was disrupted by the lack of a bridge across the Intracoastal Waterway, and thus had to be conducted via ferry. [18] Heads of cattle were among those evacuating from Cameron Parish in fears of a repeat of Hurricane Audrey, which had killed 35,000 cattle. [16] Similarly, all residents of Pecan Island, Louisiana were evacuated. [19] In Grand Isle, Louisiana, approximately 80% of the population evacuated. [18]

Though not directly at threat from Hilda, residents of Sabine Pass, Texas were evacuated to nearby towns in fears that roads linking the city to the mainland may be cut off by the hurricane's storm surge. [17] A permanent off-shore drilling platform 30 mi (48 km) offshore of Galveston, Texas was brought back to shore. [20] Schools along the coast of Louisiana including Nicholls State University and Tulane were suspended in anticipation of the hurricane. [16] [17] In Jackson, Mississippi, a federal disaster office was opened to coordinate preparation and relief efforts for Mississippi. [16] The United States Atomic Energy Commission delayed a detonation of a nuclear bomb in the Tatum Salt Dome near Hattiesburg. [18] The United States Navy scrammed planes from its air stations in Meridian, Mississippi and New Orleans, Louisiana in anticipation of Hilda. [16]

Effects

Rainfall totals from Hilda in the United States Hilda 1964 rainfall.gif
Rainfall totals from Hilda in the United States

Gulf of Mexico

The motor ship Cornelia B III, carrying a truck on deck, encountered Hilda's rough surf and winds as it traversed the Gulf of Mexico, resulting in the truck being washed overboard. [21] As Hilda tracked northward through the Gulf of Mexico, the storm threatened an estimated $350 million worth of offshore oil drilling facilities. Hilda would become the most destructive tropical cyclone to Louisiana's offshore oil industry at the time of its impact, accruing losses over $100 million. Strong winds and heavy surf destroyed thirteen oil platforms and damaged five beyond repair. [22] All but one of the lost oil rigs were built to withstand a "25-year storm", with the other constructed to withstand a "100-year storm". [23] Oil spills resulting from the affected rigs released 11,869  barrels of crude oil into the gulf. [24] Despite widespread evacuation of offshore drilling platforms, the 14 crewmembers of the Ocean Driller managed to ride out the storm, at times withstanding winds as high as 120 mph (190 km/h). [25]

United States

Gulf Coast

Louisiana

The majority of deaths associated with Hilda in Louisiana were a result of tornadoes spawned by the hurricane in its outer peripheral rainbands and squall lines, which began tracking across the region on October 3. [15] Six tornadoes and two waterspouts occurred in Louisiana due to the hurricane. Despite tracking for only 1–1.5 mi (1.6–2.4 km) near Larose, Louisiana, a violent F4 tornado killed 22 people and injured 165 others, destroying 35 homes in the process. Automobiles in the path of the twister were also damaged. Debris picked up by the tornado was found 16 mi (26 km) away in the Coteau-Bayou Blue area, or 3 miles east of Houma. This was the second of only two violent tornado ever spawned by a hurricane with the first one coming from Hurricane Carla in 1961. No other tornado in the state resulted in deaths, though multiple twisters in the New Orleans metropolitan area caused extensive damage to several automobiles and buildings and injured five. [26] The same tornadoes also knocked down power lines, knocking out power in localized areas. KLEB was knocked off the air as a result of these outages. [16]

Data from the hardest hit areas along the central Louisiana coast remains sparse due to the small population density of the area. Storm surge unofficially peaked at 10 ft (3.0 m) at the Point Au Fer Reef Light. At the mouth of the Mississippi River, tides reached as high as 6 ft (1.8 m) above mean sea level. The strongest wind report was from Franklin, Louisiana, where a station clocked sustained winds of 120 mph (190 km/h). Near the coast in Erath, a 125 ft (38 m) high water tower succumbed to Hilda's strong winds and collapsed onto an adjacent town hall where civil defense personnel were operating. [15] The incident resulted in the deaths of eight and six injuries. [26] Although there were no stations to report the intensity of winds in Erath, winds 6 mi (9.7 km) away in Abbeville reached 110 mph (175 km/h). [15] Hilda's sharp curve eastward after landfall and the advection of cold air from the north resulted in gusty winds over the New Orleans area, causing waves to break and spill over the seawall protecting the city from Lake Pontchartrain. The resulting waterfront flooding damaged fishing camps and other shoreline property. [15] [27] Elsewhere in southeastern Louisiana, strong winds stripped pecans and other nuts off of trees. [27]

Despite Hilda's intensity at landfall, [1] much of the damage attributed to the hurricane was a result of heavy rains associated with the storm and its interaction with a nearby frontal boundary. [27] [28] Rainfall caused by the storm peaked at 17.71 in (450 mm) northwest of Jeanerette. The strong winds and rain caused extensive crop damage; 98% of Louisiana's sugar crop sustained some measure of damage. Although most of the state's cotton crop was harvested prior to Hilda's landfall, the heavy rains flattened unpicked cotton in southern Louisiana, resulting in US$10 million in damage. [27] Overall, the effects of Hilda in Louisiana destroyed or heavily damaged nearly 2,600 residences and inflicted minor damage on an additional 19,000. The United States Red Cross estimated that about 5,000 people were injured and that of those 357 were hospitalized. [26]

Elsewhere
Hurricane Hilda
Hurricane Hilda Oct 1 1964.jpg
Hilda at peak intensity on October 1
IBTrACS OOjs UI icon edit-ltr-progressive.svg
Rainfall maxima by U.S. state
StateMaximaLocationNotes
Louisiana 17.71 in (450 mm)NW of Jeanerette [29]
Georgia 12.73 in (323 mm)S of Waynesboro [30]
Mississippi 12.57 in (319 mm) McComb-Pike County Airport [29]
South Carolina 12.02 in (305 mm) Caesars Head [30]
North Carolina 11.66 in (296 mm) Lake Toxaway [30]
Alabama 8.91 in (226 mm)NNW of Phenix City [29]
Tennessee 6.12 in (155 mm) Copperhill [30]
Virginia 5.48 in (139 mm) Diamond Springs [31]
Maryland 2.86 in (73 mm) Crisfield and
SW of Leonardtown 		[31]
Delaware 1.64 in (42 mm) Dover [31]

Effects in Texas were minimal, with gusts peaking at 45 mph (72 km/h) near High Island, Texas and areas of the state receiving trace amounts of precipitation at most. [20] [32] Damage was limited to the portions of the coast which were hit by a minor storm surge peaking at 3.9 ft (1.2 m) above mean sea level at Freeport. Some piers and arterial beach roads adjacent to the coast were damaged. Portions of Texas State Highway 87 on the Bolivar Peninsula were inundated by floodwater. Minor property damage occurred, and no persons were injured in Texas. [20] Tracking across the southern areas of Mississippi, [33] Hilda and later its remnants brought torrential rainfall to central and southern portions of the state. [26] The McComb-Pike County Airport received 12.57 in (319 mm) of rain, the highest precipitation total statewide. [29] The heavy rains resulted in record rainfall totals for the month of October in several locations and flash floods. However, the majority of damage in the state was a result of strong northerly winds, which caused power outages and was destructive to the state's pecan and corn crops, which had been nearing harvest. Cotton crops that were harvested prior to the passage of Hilda were largely damaged. Power outages knocked out 460 telephone circuits and over 30,000 individual telephones. Strong winds also uprooted and felled trees and their limbs in addition to as well as a 200 ft (61 m) tall radio mast near Moss Point, Mississippi. As a result of Hilda, 20 people were injured and damage exceeded $50,000. Three of those injuries were a result of a tornado which struck areas of Pearl River County, destroying a home, two barns, and a pumping station. [26] Across Mississippi, over 14,000 homes were damaged, of which 3,000 were either heavily damaged or completely destroyed. [33]

Interacting with a cold front as it traversed Alabama, the remnants of Hilda caused gusts as strong as 80 mph (130 km/h) in Mobile and Baldwin counties, downing telecommunication lines, uprooting trees, and shattering windows. Piers lining Mobile Bay were either destroyed or damaged. Five people were injured in those two counties. Strong winds in Russell and Lee counties damaged or destroyed several buildings, injuring four. In addition to straight-line winds, three tornadoes occurred across six counties in Alabama, with one injuring three people after damaging five homes, a hospital, and a plant. [26] Although rainfall peaked well inland at 8.91 in (226 mm), [29] damage as a result of rain was limited to the coast, where the combination of high tides and rain resulted in minor coastal inundation. As the remnants of Hilda moved across the Florida Panhandle on October 4–5, rough surf was produced, with high tides causing minor tidal inundation along the Florida coast. [26] One person drowned in the high surf produced by the storm off of Pensacola, Florida on October 4. Squalls in western and northern Florida produced heavy rain, [26] with a maximum occurring in Wewahitchka, which received 12.42 in (315 mm). [34] The precipitation produced localized flooding in the Tallahassee area. The squalls also produced strong winds, at times gusting to 60 mph (97 km/h) near Pensacola. A station at Naval Air Station Pensacola clocked a 59 mph (95 km/h) gust. These winds caused minor damage limited to uprooted trees and broken limbs. [26]

East Coast

Rainfall from the remnants of Hilda extended as far northeast as Delaware as a result of the remnants interacting with a frontal boundary that extended across the United States East Coast. [28] Extremely torrential rains fell over Georgia, [26] peaking at 12.73 in (323 mm) south of Waynesboro. [30] The largest precipitation totals occurred in the state's northeastern extremities, where widespread totals of 8 in (200 mm) or higher were reported. [35] The rains resulted in flash flooding, causing extensive damage to roads and other infrastructure across Georgia. [36] The excess floodwater caused streams to overflow their banks. At least 30 bridges were washed away by these swollen streams, and several county roads were washed out. [26] The most considerable damage was reported in northeastern Georgia, coincident with the high rainfall totals there. Damage in Rabun County alone exceeded US$100,000. [36] In addition to infrastructure damage, thousands of acres of farmland were inundated. [26]

Torrential rainfall continued northeastwards into the Carolinas, with statewide rainfall peaking at 11.66 in (296 mm) and 12.02 in (305 mm) in North and South Carolina, respectively. [30] The rains in North Carolina exacerbated preexisting flood conditions which had previously caused widespread agricultural and infrastructural damage as well as soil erosion. [26] Though not directly a result of Hilda's remnants, they were likely influenced by the storm's interaction with a frontal boundary. Already overflowing rivers and streams rose even further, reaching near-record levels. Raleigh experienced severe flooding, and roughly 4,000 people were forced to evacuate their homes due to dangerous floodwaters. [37] Two cars in mountainous regions were swept into inundated areas during the floods, resulting in one death. [38] Several tornadoes in six counties were also reported, injuring two. [26] Extensive wind damage was reported in Wayne County. [38]

Heavy rains in South Carolina from October 4–6 resulted in localized flash flooding, particularly near streams. [39] In mountainous regions, runoff from precipitation caused the Keowee, Saluda, and tributaries of the Broad River to swell, inundated and causing substantial damage to adjacent agricultural land and roads, in addition to breaching several small dams. The flooding triggered landslides, killing one person. Counties in the coastal plains of South Carolina also experienced farmland, road, and residential damage due to the heavy rains. [26]

Retirement

After the season, the Weather Bureau retired the name Hilda from future use in the Atlantic basin. [40] It was replaced with Hannah for the 1968 season [41]

See also

Notes

  1. ↑ All damage totals are in 1964  United States dollars unless otherwise noted.
  2. ↑ A major hurricane is a storm that ranks as Category 3 or higher on the Saffir–Simpson hurricane scale. [4]

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Tropical Storm Edouard brought coastal and minor inland flooding to Louisiana and Texas in August 2008. The fifth tropical cyclone and fifth named storm of the hurricane season, Edouard developed from a trough in the northern Gulf of Mexico on August 3. After developing into a tropical depression, it gradually strengthened and was upgraded to Tropical Storm Edouard on August 4. However, northerly wind shear initially halted any further significant intensification and also caused the storm to struggle to maintain deep convection over the center. Edouard eventually intensified further and peaked as a strong tropical storm with winds of 65 mph (100 km/h) on August 5. Shortly thereafter, the storm made landfall near Gilchrist, Texas later that day. Edouard quickly weakened and was downgraded to tropical depression by early on August 6, six hours before degenerated into a remnant low pressure area.

<span class="mw-page-title-main">Tropical Storm Abby (1964)</span> Atlantic tropical storm in 1964

Tropical Storm Abby was an exceptionally small tropical cyclone that had minor effects across Southeast Texas in early August 1964. Forming as a tropical depression out of a trough south of Louisiana on August 5, the system moved generally westward. It was not until August 7 that the system began to organize. That day, an eye rapidly formed within the system and it became a tropical storm just 60 mi (95 km) southeast of Galveston, Texas. Soon thereafter, a weather reconnaissance plane reported a barometric pressure of 1000 mbar at the storm's center. Around 18:00 UTC, the newly named Abby attained peak winds of 70 mph (115 km/h). It subsequently made landfall near Matagorda, Texas four hours later. Once onshore gradual weakening ensued, though a brief period of re-organization delayed its dissipation. Abby degenerated into an area of showers on August 8 southwest of San Antonio, Texas.

<span class="mw-page-title-main">Hurricane Andrew</span> Category 5 Atlantic hurricane in 1992

Hurricane Andrew was a compact, but very powerful and destructive Category 5 Atlantic hurricane that struck the Bahamas, Florida, and Louisiana in August 1992. It is the most destructive hurricane to ever hit Florida in terms of structures damaged or destroyed, and remained the costliest in financial terms until Hurricane Irma surpassed it 25 years later. Andrew was also the strongest landfalling hurricane in the United States in decades and the costliest hurricane to strike anywhere in the country, until it was surpassed by Katrina in 2005. In addition, Andrew is one of only four tropical cyclones to make landfall in the continental United States as a Category 5, alongside the 1935 Labor Day hurricane, 1969's Camille, and 2018's Michael. While the storm also caused major damage in the Bahamas and Louisiana, the greatest impact was felt in South Florida, where the storm made landfall as a Category 5 hurricane, with 1-minute sustained wind speeds as high as 165 mph (266 km/h) and a gust as high as 174 mph (280 km/h). Passing directly through the cities of Cutler Bay and Homestead in Dade County, the hurricane stripped many homes of all but their concrete foundations and caused catastrophic damage. In total, Andrew destroyed more than 63,500 houses, damaged more than 124,000 others, caused $27.3 billion in damage, and left 65 people dead.

References

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Sources

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