2001 Atlantic hurricane season
The 2001 Atlantic hurricane season was a fairly active Atlantic hurricane season that produced 17 tropical cyclones, 15 named storms, nine hurricanes, and four major hurricanes. The season officially lasted from June 1, 2001, to November 30, 2001, dates which by convention limit the period of each year when tropical cyclones tend to form in the Atlantic Ocean basin. The season began with Tropical Storm Allison on June 4, and ended with Hurricane Olga, which dissipated on December 6. The most intense storm was Hurricane Michelle, which attained Category 4 strength on the Saffir–Simpson Hurricane Scale.
The most damaging storms of the season were Tropical Storm Allison, which caused extensive flooding in Texas, Hurricane Iris, which struck Belize, and Hurricane Michelle, which affected several countries. Three tropical cyclones made landfall on the United States, three directly affected Canada, and three directly affected Mexico and Central America. Overall, the season caused 117 fatalities, and $11.3 billion in damage. Due to their severe damage, the names Allison, Iris, and Michelle were retired by the World Meteorological Organization.
Seasonal forecasts
are issued before each hurricane season by noted hurricane experts Philip J. Klotzbach, William M. Gray, and their associates at Colorado State University; and separately by NOAA forecasters.Klotzbach's team defined the average number of storms per season as 9.6 tropical storms, 5.9 hurricanes, 2.3 major hurricanes and ACE Index 96.1. NOAA defines a season as above-normal, near-normal or below-normal by a combination of the number of named storms, the number reaching hurricane strength, the number reaching major hurricane strength and ACE Index.
Pre-season forecasts
On December 7, 2000, Gray's team issued its first extended-range forecast for the 2001 season, predicting above-average activity. It listed a 63 percent chance of at least one major hurricane striking the U.S. mainland. This included a 43 percent chance of at least one major hurricane strike on the East Coast, including the Florida peninsula, and a 36 percent chance of at least one such strike on the Gulf Coast from the Florida Panhandle westward. The potential for major hurricane activity in the Caribbean was forecast to near average.On April 5, 2001, a new forecast was issued, calling for 12 named storms, 7 hurricanes, and 3 major hurricanes. The increase in the forecast was attributed to the warm sea surface temperatures, although the agency noted that the season would likely not be as active as previous ones due to the effect of a weak to moderate El Nino. The estimated potential for at least one major hurricane to affect the U.S. was upped slightly to 65 percent; the East Coast potential also went up slightly, and from the Florida Panhandle westward to Brownsville, Texas, the probability remained nearly the same.
Mid-season forecasts
On August 7, 2001, Gray's team issued their first mid-season forecast for the 2001 season, keeping the forecast number at 12 named storms, with 7 becoming hurricanes and 3 becoming a major hurricane, noting that sea surface temperatures and sea level pressures continued to be favorable for above-average hurricane activity. The estimated potential for at least one major hurricane to affect the U.S. was upped slightly once again to 69 percent; the East Coast potential also went up slightly to 50%, and from the Florida Panhandle westward to Brownsville, Texas, the probability was also upped slightly.On August 8, 2001, NOAA revised its season estimate slightly upwards to nine to twelve named storms, of which 6 to 8 were to be hurricanes, and 2 to 4 major hurricanes. The agency noted that sea surface temperatures continued to be favorable for above-average hurricane activity, and due to the likelihood that El Nino would not develop during the peak of the season, there was a reduced likelihood of a below-average year.
Season summary
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The season's activity was reflected with an accumulated cyclone energy rating of 110. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots or tropical storm strength. Subtropical cyclones, including the latter portion of Allison and the initial portions of Karen, Noel, and Olga, are excluded from the total.
Systems
Tropical Storm Allison
Tropical Storm Allison developed from a tropical wave in the northern Gulf of Mexico on June 4, 2001, and struck the northern Texas coast shortly thereafter. It drifted northward through the state, turned to the south, and re-entered the Gulf of Mexico. The storm continued towards the east-northeast, made landfall on Louisiana and then moved across the southeast United States and Mid-Atlantic. Allison was the first storm since Tropical Storm Frances in 1998 to affect the northern Texas coastline.The storm was a major flood disaster throughout its path from Texas to the Mid-Atlantic. The worst of the flooding occurred in Houston, Texas, where over 35 in of rain fell when Allison stalled over southeastern Texas. The storm killed 41 people, including 27 who drowned. The storm also caused $8.5 billion in damage, making it the costliest and second-deadliest tropical storm on record in the United States. Allison destroyed 2,744 homes, leaving 30,000 homeless, with residential damages totaling to $1.76 billion.
Tropical Depression Two
A tropical depression formed from a low level circulation on July 11, well to the east of the Windward Islands. It attained a maximum strength of 30 mph, with a pressure of, though vertical wind shear from a subtropical ridge to the north caused it to dissipate on July 12. It died in one day.Tropical Storm Barry
On July 24, a tropical wave moved off the coast of Africa and tracked westward. The wave entered the Caribbean on July 29 and gained in organization and convection, and organized into Tropical Storm Barry on August 3. After fluctuations in intensity, the system attained peak winds of 70 mph in the Gulf of Mexico, and headed northward before moving ashore along the Gulf Coast.The storm affected Florida; rainfall peaked at at Tallahassee, and winds gusts topped out at. Three people in Florida were killed by the storm, and total damage is estimated at around $30 million.
Tropical Storm Chantal
Tropical Storm Chantal developed from a tropical wave on August 14 in the tropical Atlantic Ocean. It tracked rapidly westward for much of its duration, and after degenerating into a tropical wave it passed through the Windward Islands. Chantal reformed and reached a peak intensity of 70 mph twice in the Caribbean Sea, and each time, wind shear and later land interaction prevented strengthening to hurricane status. On August 21 Chantal moved ashore near the border of Mexico and Belize, and it dissipated the next day.The storm produced a wind gust of 71 mph in Caye Caulker, although stronger winds were possible in a convective band to the north. On the Yucatan Peninsula, heavy rainfall led to mudslides across Quintana Roo, leaving some areas isolated.
Tropical Storm Dean
A tropical wave spawned Tropical Storm Dean on August 22 over the Lesser Antilles. Strong wind shear quickly weakened Dean to cause it to dissipate on August 23. The remnants turned northward, and redeveloped on August 26 to the north of Bermuda. Located over warm waters and in an area of favorable conditions, Dean steadily strengthened while moving to the northeast, and peaked just below hurricane status on August 27 southwest of Newfoundland. The storm subsequently weakened over cooler waters, and became extratropical on August 28. Tropical Storm Dean lightly affected Newfoundland, though no damages were reported.Hurricane Erin
Hurricane Erin developed from a tropical wave on September 1, and strengthened to a 60 mph tropical storm as it moved to the west-northwest. After weakening due to wind shear, the remnants re-organized into a tropical depression the next day, and Erin strengthened into a hurricane on September 9 while moving northwestward. The hurricane quickly intensified and reached peak winds of 120 mph later on September 9. A trough turned Erin to the northeast, and after passing just east of Cape Race, Newfoundland it became extratropical on September 15. The extratropical remnant continued northeastward and lost its identity near Greenland on September 17. Hurricane Erin brushed Newfoundland, producing a sustained wind of 53 mph with a gust of 67 mph at Cape Race. Along the coast, the passage of the storm led to wave heights of up to 30 ft.Hurricane Felix
A tropical wave spawned a tropical depression on September 7 near the Cape Verde islands, which degenerated back into a tropical wave the next day due to strong shear. It redeveloped back into a tropical depression on September 10, and intensified into Tropical Storm Felix the next day while tracking generally northward. By September 13, it intensified into a hurricane, and subsequently it underwent rapid deepening, becoming a major hurricane on September 14 with peak winds of. By that time, Felix had turned to the northeast, and subsequently entered an area of unfavorable conditions. The hurricane gradually weakened, deteriorating to a tropical storm on September 17. Cool waters and higher wind shear caused additional weakening while Felix nearly stalled to the southwest of the Azores. Late on September 18, the storm weakened to a tropical depression, and early the next day Felix dissipated.Hurricane Gabrielle
Hurricane Gabrielle originated in a weak low- to mid-level trough that was nearly stationary a short distance off the southeastern coastline of the United States. A cut off low formed over Florida on September 9, and an associated surface low pressure system formed, that was soon designated Tropical Depression Eight. The storm gradually intensified, and made landfall on Florida before emerging into the Atlantic Ocean and accelerating northeastward, as it reached peak intensity as a minimal hurricane.Hurricane Gabrielle produced moderate winds along coastal areas of western Florida, reaching at Venice. The tide flooded the northern shoreline of Charlotte Harbor and at the entrance to the Peace River, while further to the south a surge of greater than inundated the barrier island at Fort Myers Beach and flooded some cars. Gabrielle brushed the eastern coast of Newfoundland; the rainfall set the all time six-hour precipitation record at St. John's, with a total of. Hundreds of homes and buildings were damaged by the passage of Gabrielle, totaling several million Canadian dollars in damage.
Tropical Depression Nine
A tropical depression formed from a tropical wave in the Caribbean on September 19, north-northwest of San Andres Island. It attained a maximum strength of, and made landfall near Puerto Cabezas on September 20. After losing its closed circulation over land, it reformed into Hurricane Juliette in the East Pacific.Hurricane Humberto
Hurricane Humberto formed from an area of low pressure generated by Hurricane Gabrielle. The low formed into a tropical depression on September 21 while south of Bermuda, tracking northwest, and was named Tropical Storm Humberto the next day. It began moving north, and then northeast as it passed Bermuda and strengthened into a hurricane. Humberto headed over the colder waters of the far north Atlantic Ocean, and dissipated quickly on September 27.Hurricane Iris
Tropical Depression Eleven formed just southeast of Barbados on October 4. It traveled across the Windward Islands, and was named Tropical Storm Iris while south of Puerto Rico on October 5. Iris continued to the west and intensified. After passing just south of Jamaica, Iris reached Category 4 hurricane strength, and made landfall near Monkey River Town, Belize on October 9 at Category 4 strength, but weakened rapidly. It dissipated later that day.The storm produced an storm surge. Numerous homes were destroyed, and the banana crop suffered extensive damage. An exact death toll is unknown, but 31 are confirmed dead, three in the Dominican Republic, eight in Guatemala, and 20 from the M/V Wave Dancer, a ship that capsized off the Belize coast.
Tropical Storm Jerry
Tropical Storm Jerry formed as a tropical depression from a tropical wave on October 6 near Barbados. The storm intensified into a tropical storm early the following day on October 7 while initially located under an environment of weak vertical wind shear. After reaching its peak of 50 mph, Jerry passed just south of Barbados late on October 7 and through the Windward Islands on October 8. Deterioration in organization occurred, and Jerry dissipated while moving rapidly westward well south of Puerto Rico.Hurricane Karen
A cold front and an upper level trough interacted on October 10 to the south of Bermuda, and formed an extratropical storm. The storm passed near Bermuda on October 12, producing hurricane-force winds on the island. It then organized, becoming a subtropical cyclone on October 12 and a tropical cyclone on October 13. Karen strengthened to reach 80 mph winds as a Category 1 hurricane on the Saffir–Simpson Hurricane Scale, and after weakening over cooler waters, it made landfall on Nova Scotia as a tropical storm. It quickly became extratropical.Tropical Storm Karen produced light to moderate winds across Atlantic Canada, peaking at 47 mph with a gust of 64 mph in Cape George in Antigonish County, Nova Scotia, along with a 26 mph report in Charlottetown, Prince Edward Island. Later, in Newfoundland and Nova Scotia, the storm system that absorbed Hurricane Noel produced strong winds that downed several trees and power lines which resulted in power outages.
Tropical Storm Lorenzo
An upper-level tropospheric trough persisted in the eastern Atlantic Ocean, developing a circulation by October 26 which quickly organized. On October 27, it developed into Tropical Depression Fourteen about 860 miles south-southwest of the western Azores. Moving westward, the depression was forecast to attain winds of at least 60 mph, although it failed to reach that intensity. Banding features developed over the storm, and on October 30 it was upgraded to Tropical Storm Lorenzo. By early on October 31, convection had begun to separate from the circulation, and later in the day Lorenzo became extratropical; shortly thereafter, its remnants merged with a frontal system about 690 mi west of the Azores.Hurricane Michelle
Hurricane Michelle developed from a tropical wave that moved across the Atlantic, and formed into a tropical depression on October 29. Convection increased, and the system formed into Tropical Storm Michelle on November 1. It strengthened further, reaching its peak strength as a Category 4. One of only four November Category 4 hurricanes, Michelle made landfall on south-central Cuba with winds of 140 mph, the strongest Cuban landfall since Hurricane Fox in the 1952 Atlantic hurricane season.The system that eventually became Hurricane Michelle dropped torrential rains in several countries, causing six deaths in Honduras and four deaths in Nicaragua, with an extensive yet unknown amount of damage. An additional 26 people were reported missing in Central America. Michelle went on to affect Cuba, where the storm produced waves, along with a heavy storm surge. Rainfall amounts up to 29.69 in were recorded across the island.