|
|
|
|
2008 Atlantic hurricane season
|
| |
|
| |
The 2008 Atlantic hurricane season was an event in the annual cycle of tropical cyclone formation. The season 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 two days early. This season is the third most costly on record, behind only the 2004 and 2005 seasons, with over $41 billion in damage (2008 USD).
Discussion
Ask a question about '2008 Atlantic hurricane season' Start a new discussion about '2008 Atlantic hurricane season' Answer questions from other users |
Encyclopedia
The 2008 Atlantic hurricane season was an event in the annual cycle of tropical cyclone formation. The season 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 two days early. This season is the third most costly on record, behind only the 2004 and 2005 seasons, with over $41 billion in damage (2008 USD). It was the fourth busiest year since 1944 and 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. The season was devastating for Haiti, where over 800 people were killed by four consecutive tropical cyclones (Fay, Gustav, Hanna, and Ike) in August and September. Hurricane Ike was the most destructive storm of the season, as well as the strongest, devastating Cuba as a major hurricane and later making landfall near Galveston, Texas at Category 2 (nearly Category 3) intensity.
Seasonal forecasts
Predictions of tropical activity in the 2008 season | Source | Date | Named
storms | Hurricanes | Major
hurricanes | | CSU | Average (19502000) | 9.6 | 5.9 | 2.3 | | NOAA | Average (19502005) | 11.0 | 6.2 | 2.7 | | Record high activity | 28 | 15 | 8 | | Record low activity | 4 | 2 | 0 | | | | CSU | December 7, 2007 | 13 | 7 | 3 | | CSU | April 9, 2008 | 15 | 8 | 4 | | NOAA | May 22, 2008 | 1216 | 69 | 25 | | CSU | June 3, 2008 | 15 | 8 | 4 | | UKMO | June 18, 2008 | 15* | N/A | N/A | | CSU | August 5, 2008 | 17 | 9 | 5 | | NOAA | August 7, 2008 | 14-18 | 7-10 | 3-6 | | | | Actual activity | 16 | 8 | 5 | | | | * July-November only: 15 storms observed in this period. |
Forecasts of hurricane activity are issued before each hurricane season by noted hurricane experts Dr. Philip J. Klotzbach, Dr. William M. Gray, and their associates at Colorado State University; and separately by NOAA forecasters.
Dr. Klotzbach's team (formerly led by Dr. Gray) defined the average number of storms per season (1950 to 2000) as 9.6 tropical storms, 5.9 hurricanes, and 2.3 major hurricanes (storms reaching at least Category 3 strength in the Saffir-Simpson Hurricane Scale). A normal season, as defined by NOAA, has 9 to 12 named storms, with 5 to 7 of those reaching hurricane strength, and 1 to 3 major hurricanes.
Pre-season forecasts
On December 7, 2007, Klotzbach's team issued its first extended-range forecast for the 2008 season, predicting above-average activity (13 named storms, 7 hurricanes, 3 of Category 3 or higher). On April 9, 2008, the CSU issued a new forecast, anticipating a well above average hurricane season of 15 named storms, 8 hurricanes, and 4 intense hurricanes. The National Oceanic and Atmospheric Administration (NOAA) predicted an above average season with 12 to 16 storms, 6 to 9 hurricanes, and 2 to 5 major hurricanes on May 22.
Midseason outlooks
The CSU kept their April 9 forecast on June 3 with 15 storms, 8 hurricanes, and 4 major hurricanes. On June 18 the UK Met Office (UKMO) issued a forecast of 15 tropical storms in the July to November period with a 70% chance that the number would be in the range 10 to 20. However, actual predictions of the number of tropical storms, hurricanes, and major hurricanes were not given. On August 5, following the intense start, the CSU called for 17 storms, 9 hurricanes, and 5 major hurricanes, slightly higher than their prior forecast of 15 storms. On August 7, in response to the season's strong start, NOAA reaffirmed its pre-season outlook of above-average activity. The organization increased its expected probability of such a season to 85% from 65% in its May forecast.
Season summary
The 2008 hurricane season saw the first occurrence of major hurricanes in the months of July through November. Four storms formed before the start of August, and the season also had the earliest known date for three storms to be active on the same day: Hurricane Bertha, and Tropical Storms Cristobal and Dolly were all active on July 20. This season was also one of only nine Atlantic seasons on record to have a major hurricane form before August. This is also the first year four or more Category 4 storms have formed in a single year since 2005, which had 5, and was one of only 7 Atlantic seasons to feature a major hurricane in November.
The season was devastating for Haiti, where over 800 people were killed by four consecutive tropical cyclones (Fay, Gustav, Hanna, and Ike) in August and September. Hurricane Ike was the most destructive storm of the season, as well as the strongest, devastating Cuba as a major hurricane and later making landfall near Galveston, Texas at Category 2 (nearly Category 3) intensity. It caused a particularly devastating storm surge along the western Gulf Coast of the United States due to in part to its large size. Hurricane Hanna was the deadliest storm of the season, killing 537 people, mostly in Haiti. Hurricane Gustav was another very destructive storm, causing up to $8.3 billion in damage to Haiti, Jamaica, the Cayman Islands, Cuba, and the U.S. Hurricane Dolly caused up to $1.35 billion in damage to south Texas and northeastern Mexico. Hurricane Bertha was an early season Cape Verde-type hurricane that became the longest lived pre-August Atlantic tropical cyclone on record, though it caused few deaths and only minor damage.
Other notable storms in the year included Tropical Storm Arthur, which marked the first recorded time the Atlantic saw a named storm form in May in consecutive years, Tropical Storm Fay, which became the first Atlantic tropical cyclone to make landfall in the same U.S. state on 4 separate occasions; Tropical Storm Marco, the smallest Atlantic tropical cyclone recorded since 1988, Hurricane Omar, a powerful late-season major hurricane which caused moderate damage to the ABC islands, Puerto Rico, and the Virgin Islands in mid-October; and Hurricane Paloma, which became the second strongest November hurricane in recorded history and caused about $2 billion in damage to the Cayman Islands and Cuba. The only storm of the season to not reach tropical storm status, Tropical Depression Sixteen, caused significant flooding in Central America which killed more than 75 people and caused at least $150 million in damages.
Storms
Tropical Storm Arthur
Tropical Storm Arthur formed near the Belize coast early on May 31, developing out of the interaction between a tropical wave and the remnants of Tropical Storm Alma, and made landfall on Belize later that day. The system traversed the Yucatαn Peninsula slowly and dissipated inland early on June 2. When Arthur made landfall on Belize it caused an estimated US$78 million worth of damage and killed 9 people, 5 of them directly.
Arthur is the first reported tropical storm to form in May since Tropical Storm Arlene in 1981. Other systems have formed, but were subtropical (such as Andrea in 2007). Given Arthur's very short lifespan, Jeff Masters questions whether it would have been reported and named in the years prior to today's technology. The formation of Arthur also marks the first time that a named storm formed in May for two consecutive years.
Hurricane Bertha
Early on July 1, a strong and large tropical wave emerged off the coast of Africa. By early the next day, a surface low developed and the wave became better organized. The National Hurricane Center upgraded the system to Tropical Depression Two in the morning hours of July 3 after the system was able to maintain convection over its center for at least 12 hours. The depression organized further and developed two distinct bands of convection. Six hours after becoming a depression, it was upgraded to Tropical Storm Bertha, the second named storm of the season. The National Hurricane Center noted that this tropical cyclone was remarkably forecast up to a week in advance by many global computer models.
After a bout of strengthening on July 6, Bertha was upgraded to a hurricane early on July 7 as satellite and microwave imagery indicated an eye feature had formed. It continued to strengthen that morning. Rapid intensification continued that afternoon and Bertha strengthened into a major hurricane with 125 mph (205 km/h) winds and a well-defined eye. The strengthening trend abated early on July 8, due to wind shear, and Bertha rapidly weakened back to a Category 1 hurricane that afternoon.
Bertha again began to rapidly intensify on July 9 as a new eye had formed and the system became more symmetrical. The NHC upgraded Bertha to a Category 2 with winds of 105 mph (170 km/h) and stated that Bertha could intensify further to major hurricane status again, but instead weakened into an 85 mph (135 km/h) Category 1 hurricane. On July 12, Bertha slowed in movement, becoming almost stationary and by July 13 this slow movement weakened the storm to tropical storm strength. The storm brought rain and tropical storm-force winds to Bermuda on July 14, but no damage was reported. After slowly meandering to the east and then the southeast, Bertha regained hurricane strength on the 18th as it began accelerating towards the northeast. As it moved over cooler waters, it weakened slightly to a tropical storm late on July 19. It finally became extratropical on July 20 southwest of Iceland. Bertha is the longest-lived pre-August Atlantic tropical cyclone on record.
Tropical Storm Cristobal
A tropical disturbance located off the east coast central Florida formed on July 15. The system slowly developed into a Tropical Depression on July 18 while located to the south-southeast of Charleston, South Carolina. The depression gradually became better organized and was upgraded to Tropical Storm Cristobal the next day while located to the southwest of Cape Hatteras, North Carolina. Cristobal paralleled the North Carolina coastline for the next two days with minimal to no impact as most of the convection and wind was located on the eastern half of the storm. However, there was some heavy rainfall amounting up to in localized areas of southern North Carolina. On July 20, Cristobal began to move away from the coastline and began to intensify as it passed over the Gulf Stream. Cristobal peaked the next day with winds of . As Cristobal moved closer to Nova Scotia, it began to lose its tropical characteristics. By July 23, Cristobal had transitioned into an extratropical cyclone.
Hurricane Dolly
A strong tropical wave tracked across the Caribbean Sea in the third week of July. Despite producing strong convection and tropical storm-force sustained winds, it failed to develop a low-level circulation until July 20. That morning, reconnaissance aircraft found a low-level circulation and the system was declared Tropical Storm Dolly. This marked the fastest start of a hurricane season since 2005.
It made landfall early on July 21 as a weak and disorganized tropical storm near Cancun, and emerged over the Gulf of Mexico later that morning. 17 deaths were reported in Guatemala from landslides caused by heavy rain on the fringes of Dolly.
On July 22 at 4 p.m. CDT, it strengthened into the second hurricane of the season. It steadily strengthened that night into the morning of July 23 and reached Category 2 intensity. Dolly then weakened some before it made landfall at 1 p.m. CDT (1800 UTC) on South Padre Island as a Category 1 hurricane. Dolly caused no deaths in Texas but it became the most damaging hurricane to affect Texas since 2005's Hurricane Rita, with US$1.05 billion dollars in damage. It was also the most destructive hurricane to make landfall in Texas since 1983's Alicia, and was the fourth costliest Texas hurricane in history, behind Hurricane Rita, Hurricane Alicia, and Hurricane Ike later in the season. The remnant low caused flash flooding and two deaths in New Mexico before dissipating late on July 27.
Tropical Storm Edouard
A shear line stalled in the northeastern Gulf of Mexico in early August as troughing aloft dug into the northeast Gulf of Mexico. This energy aloft helped to organize a surface low along the shearline early on August 2, which slowly organized over the following day. It strengthened into Tropical Depression Five before gaining intensity and being named Tropical Storm Edouard on August 3. The storm made landfall in Southeast Texas near Port Arthur on the morning of August 5 as a strong tropical storm. As it moved inland, the system weakened into a tropical depression by afternoon. The depression dissipated late on August 6 while inland over Texas.
Tropical Storm Fay
A vigorous tropical wave tracked into the northeastern Caribbean in mid-August. It produced heavy rain across the Leeward Islands and into Puerto Rico before tracking westward, while unable to develop a low-level circulation despite producing tropical storm-force winds. On August 15, a closed circulation was found and the system was declared Tropical Storm Fay. Later that day Fay produced heavy rains on the island of Hispaniola prompting a major flash flood threat. Fay crossed Hispaniola, Cuba, and hit south Florida beginning late on August 18, slowly tracking northeastward across the peninsula. Significant flooding resulted in much of eastern Florida, along with some wind damage. After crossing into the Atlantic, Fay turned westward again and crossed northern Florida on August 22. As it zigzagged from water to land, it became the first storm in recorded history to make landfall in Florida four times. Fay weakened into a tropical depression along the north coast of the Gulf of Mexico. Fay eventually became extratropical on the morning of August 27 while located over Tennessee. Fay was responsible for 36 deaths and at least $560 million in damage (2008 USD).
Hurricane Gustav
A disturbance developed in the deep tropical Atlantic in the fourth week of August. It tracked westward into the Caribbean Sea where it encountered more favorable conditions, and became a tropical depression on the morning of August 25, west of the Windward Islands. It rapidly intensified into Tropical Storm Gustav early that afternoon and into Hurricane Gustav early on August 26. Striking southwest Haiti, it weakened into a tropical storm on the evening of August 27 due to land interaction and slowed down considerably. It re-organized further south into a strong tropical storm once again on August 28 before speeding up and hitting Jamaica. Gustav has killed 85 people in Haiti, the Dominican Republic, and Jamaica, while 7 are still missing in Haiti. It then was upgraded to a hurricane again during the late afternoon of August 29. On the morning of August 30, Gustav was upgraded to a major Category 3 hurricane. After intensification slowed for a few hours, another round of rapid intensification occurred and Gustav was upgraded to a Category 4 hurricane during a hurricane hunter flight around 1 p.m. EDT (1700 UTC), with 145 mph (215 km/h) winds. Continuing to intensify, it became a 150 mph storm that afternoon before landfall. Soon after Gustav made landfall in Cuba, firstly on the island of Isla de la Juventud and later on the mainland near Los Palacios in Pinar del Rνo Province, causing catastrophic damage, although it was difficult to estimate it; damage was later estimated at 3 billion dollars (2008 USD). It then emerged into the Gulf of Mexico on August 30, weakening into a Category 3 hurricane with 115 mph (185 km/h) winds. However, the hurricane was still large, and early the next day, it made landfall on Louisiana. At 8 a.m. CDT September 1 the storm weakened to Category 2 just before landfall. On September 4, Gustav was absorbed by a cold front while over the Ozarks. Gustav is responsible for 153 deaths and at least $8.5 billion in damage.
Hurricane Hanna
Tropical Depression Eight formed on August 28 from a low pressure area east-northeast of the northern Leeward Islands. It was upgraded to a tropical storm later that day and named Hanna. On September 1, while Hanna was moving very near to the island of Mayaguana in the Bahamas, it was upgraded to Category 1 hurricane status. Hanna meandered around the southeastern Bahamas, weakening to a tropical storm while also dumping heavy rain on already-devastated Haiti. Hanna moved rapidly northeastwards along the east coast of the United States as a tropical storm. Hanna transitioned into an extratropical cyclone as it moved offshore from Massachusetts early on September 7. At least 537 deaths were blamed on Hanna, primarily in Haiti.
Hurricane Ike
A tropical disturbance developed off the coast of Africa near the end of August. It tracked south of Cape Verde and slowly developed. On September 1 it became Tropical Depression Nine while west of the Cape Verde islands and intensified into a tropical storm later that day, when it was given the name Ike. Ike developed an eye late on September 3 as it underwent explosive intensification, as it strengthened from a tropical storm to a Category 4 hurricane in twelve hours with an estimated pressure drop of , from ; and a 24 hour pressure drop of , from . Ike weakened back to a Category 2 hurricane before re-intensifying back to Category 4. It ripped across Great Inagua Island and Grand Turk Island, where 80% of the buildings on Grand Turk were severely damaged or completely destroyed. It weakened into a strong Category 3 late in the afternoon of September 7 as it headed for landfall on the northeastern coastline of Cuba that evening. In addition, the storm killed at least 74 people in Haiti and 1 person in the Dominican Republic.
As Ike crossed Cuba on September 8 it weakened to a Category 1 hurricane and emerged into the Caribbean Sea, where it moved along or just off of the southern coast of Cuba. Ike killed 7 people as it traversed nearly the entirety of Cuba. It crossed into the Gulf of Mexico on September 9 and ballooned in size. Ike maintained a double eyewall structure across most of the Gulf of Mexico and continued to expand in size. It made landfall on Galveston Island on September 13 as a strong Category 2 hurricane, but its large size brought storm surge of over from Galveston Island eastward into southern Louisiana. The Bolivar Peninsula was worst affected by the surge, while Galveston Island (where waves topped the seawall) and the Port Arthur areas also saw extensive damage. Power was knocked out to most of the Houston area and windows were blown out of skyscrapers in downtown Houston. As Ike moved inland, it brought extensive flooding and wind damage throughout the Midwest and as far north as Pennsylvania. It became extratropical on September 14.
Damage from Ike is estimated at $28.2 billion (2008 USD) of which $24 billion was in the US, the third most destructive U.S. hurricane on record, behind Katrina in 2005 and Andrew in 1992. At least 195 fatalities have been blamed on Ike, of which 112 were in the United States. It was the most destructive hurricane in Texas history. Ike was an extremely large and powerful storm. At one point, the diameter of Ike's tropical storm and hurricane force winds were 600 and 240 miles (965 and 390 km), respectively, making Ike the largest Atlantic hurricane ever recorded. Ike also had the highest Integrated Kinetic Energy (IKE) of any Atlantic storm. IKE is a measure of storm surge destructive potential, similar to the Saffir-Simpson Hurricane Scale, though it is more complex and in many ways more accurate. On a scale that ranges from 1 to 6, with 6 being highest destructive potential, Ike earned a 5.6.
Tropical Storm Josephine
A tropical disturbance developed off the coast of Africa near the end of August. It tracked south of Cape Verde and slowly developed. On September 2 it became Tropical Depression Ten while south-southeast of the southernmost Cape Verde islands. The depression was upgraded to a tropical storm later the same day as it passed to the south of the Cape Verde islands. Strong wind shear weakened the system over the next few days, and it dissipated on September 6 without coming near any land. On September 7 the ex-Josephine disturbance regained some organization and regeneration seemed possible, but the low became exposed again and the NHC discontinued their statement about regeneration possibilities. The remnant lingered on for a few days, with a report on September 11 that it might regenerate, but dissipated without further action.
Hurricane Kyle
A strong tropical disturbance tracked across the northeastern Caribbean Sea in the third week of September. It meandered around Puerto Rico and Hispaniola, dumping torrential rains across those islands causing a significant amount of damage, despite never developing a closed circulation. By September 24, it began to track northward away from the islands and into the open Atlantic water, and became a tropical storm on September 25. Kyle was upgraded to a hurricane during the afternoon of September 27. It continued northward and maintained hurricane strength until landfall near Yarmouth, Nova Scotia in Canada late on September 28. A few hours later, Kyle became extratropical as the cold waters of the Bay of Fundy took effect. In general, Maritimers were spared the anticipated damage.
Tropical Storm Laura
In the last week of September, a very large non-tropical system over the north-central Atlantic slowly moved westward away from the Azores. As it entered warmer waters, it slowly gained tropical characteristics and was declared Subtropical Storm Laura early on September 29. It became fully tropical the next day and was reclassified as Tropical Storm Laura. On October 1 it became "post-tropical" as it moved over cooler waters.
Tropical Storm Marco
Tropical Depression Thirteen formed from a very small but well-organized low in the Bay of Campeche on October 6. It rapidly intensified into Tropical Storm Marco with 65 mph (100 km/h) winds that afternoon. Marco made landfall near Veracruz, Mexico the next morning at the same intensity. Marco dissipated that night as the small circulation moved inland. At one point, tropical storm-force winds were estimated to extend only 10 miles from the center, which makes it the smallest Atlantic tropical cyclone on record.
Tropical Storm Nana
A disturbance that had been drifting toward the northwest for the previous couple days showed no signs of strong convection until October 12, when it strengthened into Tropical Depression Fourteen. It then turned to the north, then to the west and later strengthened into Tropical Storm Nana, the fourteenth storm of the season. It formed in the Atlantic, roughly halfway between the west coast of Africa and the Lesser Antilles. Just after reaching its peak intensity of a mere 40 miles per hour, Nana was downgraded to a depression. The storm weakened into a remnant low on October 14. No deaths were associated with the storm. This is the first use of the name Nana since 1990.
Hurricane Omar
A tropical disturbance in the eastern Caribbean Sea was in an area unfavorable for development in the second week of October. While drifting across the region, upper-level winds diminished enough for the tropical disturbance to strengthen and to develop into Tropical Depression Fifteen on October 13. It strengthened to Tropical Storm Omar the next day. Omar quickly strengthened into a 70 mph (110 km/h) storm that afternoon, and became a hurricane that night. It remained a hurricane through that night and it changed little in intensity through the next day, but that evening Omar intensified quickly and became a 115 mph Category 3 storm, and became a 125 mph (205 km/h) storm the next morning. In a discussion supplied by the National Hurricane Center, it stated that Omar may have peaked as a minimal Category 4 early that morning. This was later confirmed in November in their Running Best Track. However, wind shear and dry air quickly weakened Omar to a minimal hurricane that afternoon as it raced towards the northeast at 26 mph (41 km/h), and soon it dropped to tropical storm strength. It then degenerated to a remnant low the next day. Omar caused at least $60 million in damage to the Lesser Antillies (2008 USD), and killed 2 people, both in Puerto Rico.
Tropical Depression 16
Was the only storm of the season that make landfall in central america. A vigorous disturbance in the western Caribbean slowly developed off the coast of Nicaragua. It organized enough to become Tropical Depression Sixteen on October 14. Because the depression hugged the Honduras coast it there by preventing much strengthening. The disorganized center made landfall in Punta Patuca Honduras on October 15. It dissipated inland that evening, reaching tropical storm intensity hour before. Its remnants however became nearly stationary in the area between northern Costa Rica and southeastern Mexico and continued to produce locally heavy rains for several days. However, it did not regenerate. This storm caused about $150 million in damage (2008 USD), and killed at least 75 people.
Hurricane Paloma
An area of low pressure became stationary in the Caribbean Sea without showing tropical development for several days at the beginning of November. Finally, on November 5 the low pressure system organized and became Tropical Depression Seventeen just east of Nicaragua. The next day it strengthened to become Tropical Storm Paloma then later, Hurricane Paloma. The following days proved to be a rarity in terms of tropical cyclone intensity in the month of November. This was seen when Paloma was upgraded to a Category 2, then later a Category 3 major hurricane. Paloma continued to strengthen and peaked with winds of 145 mph, making it the second strongest November hurricane behind 1999's Lenny, by the afternoon of the 8th, but Paloma weakened rapidly before making landfall as a Category 2 hurricane on the evening of November 8 near Santa Cruz del Sur, Cuba. On November 9, Paloma was downgraded to a tropical storm and then a depression. Later that evening, the storm finally met its demise as it transformed into a remnant low. Paloma caused up to $1.4 billion (2008 USD) in damage to Cuba, and $609 million in damage to the Cayman Islands.
Accumulated Cyclone Energy (ACE)
The table on the right shows the ACE for each storm in the season. 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 (such as Bertha) as well as particularly strong hurricanes (such as Ike), have high ACEs. ACE is only officially released for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength, so Tropical Depression Sixteen does not have an ACE. Subtropical storms are not included in season totals, and thus values accrued while Laura was subtropical are not included in its ACE total.
Storm names
The following names were used for named storms that formed in the North Atlantic in 2008. The list was the same as the 2002 list except for Ike and Laura, which replaced Isidore and Lili, respectively. The names Ike, Omar and Paloma were used for Atlantic storms the first time this year, but Laura was previously used in 1971. Names that were not used are marked in .
Retirement
Retired names, if any, will be announced by the World Meteorological Organization in the spring of 2009. The names not retired from this list will be used again in the 2014 season.
Season effects
This is a table of the storms in 2008 and their landfall(s), if any. Deaths in parentheses are additional and indirect (an example of an indirect death would be a traffic accident), but are still storm-related. Damage and deaths include totals while the storm was extratropical or a wave or low.
See also
External links
|
| |
|
|
