Hurricane Florence (2006)
Encyclopedia
Hurricane Florence was the first Atlantic hurricane
Atlantic hurricane
North Atlantic tropical cyclones usually form in the northern hemisphere summer or fall. Tropical cyclones can be categorized by intensity. Tropical storms have one-minute maximum sustained winds of at least 39 mph , while hurricanes have one-minute maximum sustained exceeding 74 mph...

 to produce hurricane force winds on Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

 since Hurricane Fabian
Hurricane Fabian
Hurricane Fabian was a powerful Cape Verde-type hurricane that hit Bermuda in early September during the 2003 Atlantic hurricane season. Fabian, the sixth named storm, fourth hurricane, and first major hurricane of the season, developed from a tropical wave in the tropical Atlantic Ocean on August 25...

 hit the island in September 2003. The seventh tropical storm
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...

 and second hurricane of the 2006 Atlantic hurricane season
2006 Atlantic hurricane season
The 2006 Atlantic hurricane season was significantly less active than the record previous season. It marked the first since 2001 in which no hurricanes made landfall in the United States, and was the first since 1994 that no tropical cyclones formed during October. Following the intense activity of...

, Florence developed from a tropical wave
Tropical wave
Tropical waves, easterly waves, or tropical easterly waves, also known as African easterly waves in the Atlantic region, are a type of atmospheric trough, an elongated area of relatively low air pressure, oriented north to south, which move from east to west across the tropics causing areas of...

 in the tropical Atlantic Ocean
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

 on September 3 and followed the track of a Cape Verde-type hurricane
Cape Verde-type hurricane
A Cape Verde-type hurricane is an Atlantic hurricane that develops near the Cape Verde islands, off the west coast of Africa. The average hurricane season has about two Cape Verde-type hurricanes, which are usually the largest and most intense storms of the season because they often have plenty of...

. Due to unfavorable conditions, the system failed to organize initially, and as a result the storm grew to an unusually large size. After several days, Florence encountered an area of lesser wind shear
Wind shear
Wind shear, sometimes referred to as windshear or wind gradient, is a difference in wind speed and direction over a relatively short distance in the atmosphere...

 and intensified into a hurricane on September 10. It passed just west of Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

 while recurving northeastward, and on September 13 it transitioned into an extratropical cyclone
Extratropical cyclone
Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth having neither tropical nor polar characteristics, and are connected with fronts and...

.

Florence produced wind gusts of up to 115 mph (185 km/h) on Bermuda, which caused several power outages and minor damage. Florence then brought heavy rains across Newfoundland as an extratropical storm, destroying one house and causing minor damage to several others. There were no fatalities as a result of the hurricane.

Meteorological history

A tropical wave
Tropical wave
Tropical waves, easterly waves, or tropical easterly waves, also known as African easterly waves in the Atlantic region, are a type of atmospheric trough, an elongated area of relatively low air pressure, oriented north to south, which move from east to west across the tropics causing areas of...

 moved off the coast of Africa
Africa
Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

 on August 29. It tracked slowly westward, and first showed signs of development two days later. On August 31, a second tropical wave exited the coast of Africa at a faster speed than its predecessor. The two waves interacted, and by September 2 combined to form a large area of disturbed weather across the eastern Atlantic Ocean
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

. Convection
Convection
Convection is the movement of molecules within fluids and rheids. It cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids....

 increased within the system, and it developed a concentrated area of convection in conjunction with a well-defined low pressure area
Low pressure area
A low-pressure area, or "low", is a region where the atmospheric pressure at sea level is below that of surrounding locations. Low-pressure systems form under areas of wind divergence which occur in upper levels of the troposphere. The formation process of a low-pressure area is known as...

. By late on September 3, the system maintained a broad closed circulation and enough convective organization to be classified Tropical Depression Six while located about midway between the Lesser Antilles
Lesser Antilles
The Lesser Antilles are a long, partly volcanic island arc in the Western Hemisphere. Most of its islands form the eastern boundary of the Caribbean Sea with the Atlantic Ocean, with the remainder located in the southern Caribbean just north of South America...

 and Africa.
Upon becoming a tropical cyclone, the depression maintained multiple cloud swirls within a common center. Banding features increased, though southwesterly wind shear
Wind shear
Wind shear, sometimes referred to as windshear or wind gradient, is a difference in wind speed and direction over a relatively short distance in the atmosphere...

 and the lack of a well-defined circulation prevented initial strengthening. Dry air encountered the depression, and as such it developed very slowly; forecasters maintained considerable difficulty in determining a center of circulation. It continued its motion to the west-northwest while tracking around the southern periphery of a deep-layer subtropical ridge
Subtropical ridge
The subtropical ridge is a significant belt of high pressure situated around the latitudes of 30°N in the Northern Hemisphere and 30°S in the Southern Hemisphere. It is characterized by mostly calm winds, which acts to reduce air quality under its axis by causing fog overnight, and haze during...

 to its north. Though convection remained focused near the outer periphery of the system, the overall organized continued to steadily increase, and it is estimated the depression intensified into Tropical Storm Florence on September 5 while located about 1,120 miles (1,800 km) east-northeast of Anguilla
Anguilla
Anguilla is a British overseas territory and overseas territory of the European Union in the Caribbean. It is one of the most northerly of the Leeward Islands in the Lesser Antilles, lying east of Puerto Rico and the Virgin Islands and directly north of Saint Martin...

.

After attaining tropical storm status, the maximum sustained winds fluctuated for three days between 40 mph (65 km/h) and 50 mph (85 km/h). This was due to the large size of Florence; the overall wind field reached a diameter of 460 miles (745 km), and the radius of maximum winds reached about 110 miles (170 km). By September 6, a well-defined cloud swirl became evident, with thin rainbands developing in the southeast and northwest quadrants. As a result, hurricane forecasters anticipated Florence would develop significantly and attain major hurricane status
Tropical cyclone scales
Tropical systems are officially ranked on one of several tropical cyclone scales according to their maximum sustained winds and in what oceanic basin they are located...

. Though convection gradually migrated closer to the center of the storm, forecasters could not detect a well-defined center of circulation by late on September 13. On September 7, convection developed over and to the west of the center for the first time in its duration. However, Florence failed to intensify further, as its wind field had increased to more than 1,035 miles (1,670 km) in diameter. This led to difficulties in forecasting, as its environment favored further strengthening; the storm tracked through an area of 84° F
Fahrenheit
Fahrenheit is the temperature scale proposed in 1724 by, and named after, the German physicist Daniel Gabriel Fahrenheit . Within this scale, the freezing of water into ice is defined at 32 degrees, while the boiling point of water is defined to be 212 degrees...

 (29°  C
Celsius
Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius , who developed a similar temperature scale two years before his death...

) water temperatures and light shear, and the system maintained a large low-level cyclonic envelop with abundant convection. By early on September 8, the storm consisted of an elongated, shapeless cloud pattern atypical of a tropical cyclone. Later that day, as an anticyclone
Anticyclone
An anticyclone is a weather phenomenon defined by the United States' National Weather Service's glossary as "[a] large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere"...

 developed over Florence, the storm began to consolidate around a vorticity center on the western side of the large cyclonic envelope. It began to strengthen more steadily as it turned to the northwest. Early on September 10, an eye
Eye (cyclone)
The eye is a region of mostly calm weather found at the center of strong tropical cyclones. The eye of a storm is a roughly circular area and typically 30–65 km in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the second most severe weather of a cyclone...

 began developing within a round central dense overcast over the center, and shortly thereafter Florence attained hurricane status while located about 390 miles (630 km) south of Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

.

Hurricane Florence turned to the north and north-northeast through a break in the subtropical ridge. Though its eyewall was open on the north side, favorable conditions led forecasters to predict Florence passing near Bermuda as a strong Category 2
Saffir-Simpson Hurricane Scale
The Saffir–Simpson Hurricane Scale , or the Saffir–Simpson Hurricane Wind Scale , classifies hurricanes — Western Hemisphere tropical cyclones that exceed the intensities of tropical depressions and tropical storms — into five categories distinguished by the intensities of their sustained winds...

 hurricane. The inner core of convection became ragged-looking on satellite imagery, and based on reports from Hurricane Hunters
Hurricane Hunters
The Hurricane Hunters are aircraft that fly into tropical cyclones in the North Atlantic Ocean and Northeastern Pacific Ocean for the specific purpose of directly measuring weather data in and around those storms. In the United States, the Air Force, Navy, and NOAA units have all participated in...

 it is estimated the hurricane attained peak winds of 90 mph (150 km/h) late on September 10. Subsequent to further erosion of the eyewall, the hurricane weakened, and on September 11 passed about 60 miles (95 km) west of Bermuda with winds of 85 mph (135 km/h). The overall cloud pattern became slightly better organized, and Florence briefly re-strengthened before encountering increased upper-level winds and cooler waters. Dry air wrapping around the southern periphery of the cyclone eroded most of the deep convection by early on September 12. The cloud shield became asymmetrically displaced to the north of the center, and frontal-like features began to form. It continued to lose tropical characteristics, and on September 13 Florence transitioned into an extratropical cyclone
Extratropical cyclone
Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are a group of cyclones defined as synoptic scale low pressure weather systems that occur in the middle latitudes of the Earth having neither tropical nor polar characteristics, and are connected with fronts and...

 about 485 miles (780 km) south-southwest of Cape Race
Cape Race
Cape Race is a point of land located at the southeastern tip of the Avalon Peninsula on the island of Newfoundland, Canada. Its name is thought to come from the original Portuguese name for this cape, "Raso", or "bare"...

, Newfoundland
Newfoundland and Labrador
Newfoundland and Labrador is the easternmost province of Canada. Situated in the country's Atlantic region, it incorporates the island of Newfoundland and mainland Labrador with a combined area of . As of April 2011, the province's estimated population is 508,400...

. Initially maintaining hurricane-force winds, the extratropical remnant passed near Cape Race before turning to the east-northeast, and on September 14 the winds weakened to gale force. The storm executed a broad cyclonic half-loop to the southwest of Iceland
Iceland
Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

 over the subsequent days, and after turning to the west the extratropical remnants of Florence were absorbed to the east of Greenland
Greenland
Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...

 by a developing extratropical cyclone to its south.

Preparations

The government of Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

 issued a hurricane watch
Tropical cyclone warnings and watches
Warnings and watches are two levels of alert issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. They are notices to the local population and civil authorities to make appropriate...

 for the island on September 8, which was followed by a tropical storm warning on September 9. These were replaced by a hurricane warning on September 10, coinciding with the storm's strengthening to hurricane intensity. The government urged the potentially impacted citizens to take preparations for the storm, many of whom bought supplies at local hardware stores. Residents installed storm shutters, while boat owners moved their yachts to safer locations. An emergency shelter was prepared on the island. Prior to the arrival of the storm, officials canceled bus and ferry service, and also closed all schools and government offices on the day of impact. The Bermuda International Airport
Bermuda International Airport
L.F. Wade International Airport , formerly named Bermuda International Airport, is the sole airport serving Bermuda, a British overseas territory in the North Atlantic Ocean. It is located in the parish of St. George's and is northeast of Bermuda's capital city of Hamilton. In 2006, L.F. Wade...

 was also closed.

Impact

Hurricane Florence produced strong swells and dangerous surf conditions along the northern Lesser Antilles
Lesser Antilles
The Lesser Antilles are a long, partly volcanic island arc in the Western Hemisphere. Most of its islands form the eastern boundary of the Caribbean Sea with the Atlantic Ocean, with the remainder located in the southern Caribbean just north of South America...

, Virgin Islands
Virgin Islands
The Virgin Islands are the western island group of the Leeward Islands, which are the northern part of the Lesser Antilles, which form the border between the Caribbean Sea and the Atlantic Ocean...

, Puerto Rico
Puerto Rico
Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

, Hispaniola
Hispaniola
Hispaniola is a major island in the Caribbean, containing the two sovereign states of the Dominican Republic and Haiti. The island is located between the islands of Cuba to the west and Puerto Rico to the east, within the hurricane belt...

, and Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

. Later in its duration, the tight pressure gradient between Florence and a high-pressure system over southeastern Canada produced strong winds and rough waves along the East Coast of the United States
East Coast of the United States
The East Coast of the United States, also known as the Eastern Seaboard, refers to the easternmost coastal states in the United States, which touch the Atlantic Ocean and stretch up to Canada. The term includes the U.S...

. The hurricane also caused strong swells and rough ocean conditions, including rip currents, in the Bahamas and Atlantic Canada
Atlantic Canada
Atlantic Canada is the region of Canada comprising the four provinces located on the Atlantic coast, excluding Quebec: the three Maritime provinces – New Brunswick, Prince Edward Island, and Nova Scotia – and Newfoundland and Labrador...

. In South Carolina
South Carolina
South Carolina is a state in the Deep South of the United States that borders Georgia to the south, North Carolina to the north, and the Atlantic Ocean to the east. Originally part of the Province of Carolina, the Province of South Carolina was one of the 13 colonies that declared independence...

, high waves produced severe beach erosion on several beaches.

]
Passing a short distance west of Bermuda
Bermuda
Bermuda is a British overseas territory in the North Atlantic Ocean. Located off the east coast of the United States, its nearest landmass is Cape Hatteras, North Carolina, about to the west-northwest. It is about south of Halifax, Nova Scotia, Canada, and northeast of Miami, Florida...

, Hurricane Florence produced strong winds on the island; sustained winds peaked at 82 mph (132 km/h) on St. David's Island
St. David's Island, Bermuda
St. David's Island is one of the main islands of Bermuda. It is located in the far north of the territory, one of the two similarly sized islands that makeup the majority of St...

 at an elevation of 410 feet (48 m), while gusts reached 115 mph (185 km/h) at the Maritime Operations Centre in St. George's Parish
St. George's Parish, Bermuda
St. George's Parish is one of the nine parishes of Bermuda. It is named after the founder of the Bermuda colony, Admiral Sir George Somers.It is located in the north-easternmost part of the island chain, containing a small part of the main island around Tucker's Town and the Tucker's Town...

 at an elevation of 665 feet (78 m). The winds knocked down trees and power lines, leaving over 25,000 homes and businesses without electricity during the peak of the storm. The powerful winds damaged ten houses, including destroying the roofs of three, and blew out windows across the island. A few people were injured by flying glass, though none required hospital care. Rainfall on the island reached 1.32 inches (34 mm) at the Bermuda International Airport
Bermuda International Airport
L.F. Wade International Airport , formerly named Bermuda International Airport, is the sole airport serving Bermuda, a British overseas territory in the North Atlantic Ocean. It is located in the parish of St. George's and is northeast of Bermuda's capital city of Hamilton. In 2006, L.F. Wade...

.
A possible tornado in Southampton Parish
Southampton Parish, Bermuda
Southampton Parish is one of the nine parishes of Bermuda. It is named for Henry Wriothesley, 3rd Earl of Southampton .It is located in the southwest of the island chain, occupying all of the western part of the main island, except for the westernmost tip...

 downed trees and caused light property damage. At the Bermuda Zoo and Aquarium, two flamingos died due to falling branches. During the peak of the storm, police officials advised citizens to remain indoors away from harm, though there were several reports of looting throughout the territory. On the island, the storm's damage totaled over $200,000 (2006 USD). Shortly after the storm passed through, BELCO began restoring power, and by six hours after the peak of the storm power had been restored to 7,000 homes and businesses. By the day after the storm, about 3,000 remained without electricity on the island. The storm damaged the causeway
The Causeway, Bermuda
The Causeway is a narrow strip of reclaimed land and bridges in the north of Bermuda linking Hamilton Parish on the mainland in the southwest and Bermuda International Airport on St. David's Island in St. George's Parish in the northeast, which are otherwise divided by Castle Harbour.The need for...

 between St. David's Island
St. David's Island, Bermuda
St. David's Island is one of the main islands of Bermuda. It is located in the far north of the territory, one of the two similarly sized islands that makeup the majority of St...

 and Hamilton Parish
Hamilton Parish, Bermuda
Hamilton Parish is one of the nine parishes of Bermuda. It was renamed for Scottish aristocrat James Hamilton, 2nd Marquess of Hamilton when he purchased the shares originally held in the Virginia Company by Lucy, Countess of Bedford.It is located in the northwest of the island chain, and is...

, temporarily limiting traffic to one lane in each direction.

As an extratropical storm over Newfoundland, Florence produced powerful winds peaking at 101 mph (163 km/h) and moderate amounts of rainfall of up to 2.6 inches (67 mm). Flooding and power outages were reported, although they were isolated. The hurricane caused flight interruptions at St. John's International Airport
St. John's International Airport
St. John's International Airport is an international airport located northwest of St. John's, Newfoundland and Labrador, Canada that serves the St. John's Metro Area and the Avalon Peninsula. The airport is part of the National Airports System, and is operated by St...

 and also to the Trans Canada ferry between Newfoundland and Cape Breton Island
Cape Breton Island
Cape Breton Island is an island on the Atlantic coast of North America. It likely corresponds to the word Breton, the French demonym for Brittany....

 in eastern Nova Scotia
Nova Scotia
Nova Scotia is one of Canada's three Maritime provinces and is the most populous province in Atlantic Canada. The name of the province is Latin for "New Scotland," but "Nova Scotia" is the recognized, English-language name of the province. The provincial capital is Halifax. Nova Scotia is the...

. Strong winds destroyed a house in the small Newfoundland village of Francois
Francois, Newfoundland and Labrador
Francois is a settlement in the Canadian province of Newfoundland and Labrador, which had a population of 134 in the Canada 2006 Census. The tallest mountain in the community is the 600 ft Frier, and there are several walking trails in the area. The community has very little unemployment. The...

. Residents in Francois agreed to rebuild the wrecked home while the family temporarily resided in a summer home of another family. The winds also caused damage to shingles and sides of homes, while the strong waves damaged roads and boats along the Burin Peninsula
Burin Peninsula
The Burin Peninsula is a Canadian peninsula located on the south coast of the island of Newfoundland in the province of Newfoundland and Labrador....

. When Tropical Storm Florence
Hurricane Florence (2006)
Hurricane Florence was the first Atlantic hurricane to produce hurricane force winds on Bermuda since Hurricane Fabian hit the island in September 2003. The seventh tropical storm and second hurricane of the 2006 Atlantic hurricane season, Florence developed from a tropical wave in the tropical...

 developed during 2006, this was the eighth time that the name Florence was used on an Atlantic tropical cyclone.

See also

  • List of Atlantic hurricanes
  • Timeline of the 2006 Atlantic hurricane season
    Timeline of the 2006 Atlantic hurricane season
    The 2006 Atlantic hurricane season was the first since 2001 in which no hurricanes made landfall in the United States, and the first since 1994 that no tropical cyclones formed during October. This timeline documents all the storm formations, strengthening, weakening, landfalls, extratropical...

  • List of storms in the 2006 Atlantic hurricane season

External links


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