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2OO7 ATLANTIC HURRICANE SEASON PDF Print E-mail
Thursday, 31 May 2007


The 2007 Atlantic hurricane season is an ongoing event in the annual cycle of tropical cyclone formation. It will officially start June 1, 2007, and will last until November 30, 2007.

These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin; however, the formation of Subtropical Storm Andrea on May 9 marked an earlier beginning to the season. This was the second occasion in five years that a storm formed before the official season start date; the other occurrence was Tropical Storm Ana in April 2003.

Seasonal forecasts
Forecasts of hurricane activity are issued before each hurricane season by noted hurricane experts Philip J. Klotzbach, Dr. William M. Gray, and their associates at Colorado State University; and separately by NOAA forecasters.

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 exceeding Category 3 strength in the Saffir- Simpson Hurricane Scale). A normal season, as defined by NOAA, has 6 to 14 named storms, with 4 to 8 of those reaching hurricane strength, and 1 to 3 major hurricanes.

Pre-season forecasts
On December 8, 2006, Klotzbach's team issued its first extended-range forecast for the 2007 season, predicting aboveaverage activity (14 named storms, 7 hurricanes, 3 of Category 3 or higher).

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The team predicted a high potential for at least one major hurricane to directly impact the United States: the forecast indicated a 64% chance of at least one major hurricane striking the U.S. mainland, which included a 40% chance of at least one major hurricane strike on the East Coast of the United States including the Florida peninsula, and a 40% chance of at least one major hurricane strike on the Gulf Coast of the United States from the Florida Panhandle westward. The potential for major hurricane activity in the Caribbean was forecast to be above average, and the team predicted El Niño to dissipate by the active portion of the season.

On April 3 a new forecast was issued, calling for a very active hurricane season of 17 named storms, 9 hurricanes and 5 intense hurricanes.

The increase in the forecast was attributed to the rapid dissipation of El Niño conditions. The team also forecast a neutral or weak-to-moderate La Niña for the hurricane season, and noted that sea-surface temperatures were much higher than long-term averages. The potential for at least one major hurricane impacting the U.S. was increased to 74%, with the U.S. East Coast potential increased to 50% and from the Florida Panhandle westward to Brownsville, Texas increased to 49%. However, Klotzbach noted that while they were calling for an active season, it was not forecast to be "as active as the 2004 and 2005 seasons".

On May 22, 2007, NOAA released their pre-season forecast for the 2007 season. They predicted 13 to 17 named storms, with 7 to 10 becoming hurricanes, and 3 to 5 becoming major hurricanes.

Storm names
The following names will be used for named storms that form in the Atlantic basin in 2007. Names to be retired, if any, will be announced by the World Meteorological Organization in the spring of 2008. The names not retired from this list will be used again in the 2013 season. The name Andrea was used for the first time in the 2007 season. The list is the same as the 2001 list except for Andrea, Ingrid, and Melissa, which replaced Allison, Iris, and Michelle, respectively. Names that have not been assigned are marked in gray.
  • Andrea
  • Barry (unused)
  • Chantal (unused)
  • Dean (unused)
  • Erin (unused)
  • Felix (unused)
  • Gabrielle (unused)
  • Humberto (unused)
  • Ingrid (unused)
  • Jerry (unused)
  • Karen (unused)
  • Lorenzo (unused)
  • Melissa (unused)
  • Noel (unused)
  • Olga (unused)
  • Pablo (unused)
  • Rebekah (unused)
  • Sebastien (unused)
  • Tanya (unused)
  • Van (unused)
  • Wendy (unused)

Subtropical Storm Andrea
Subtropical Storm Andrea (2007)
Duration May 9— May 11
Intensity 45 mph
(75 km/h), 1002 mbar

On May 9, a previously extratropical cyclone organized into Subtropical Storm Andrea while located about 140 miles (225 km) southeast of Savannah, Georgia. Tropical storm watches were immediately issued for parts of coastal Georgia and Florida, though were later dropped. It is the first named storm to form in May since Arlene in the 1981 Atlantic hurricane season, and the first preseason storm since Ana in April 2003. Later, the organization of the system deteriorated with a significant decrease in convection as it moved over cooler waters, and on May 10 it weakened to a subtropical depression and NHC issued its final advisory on Andrea at 11 PM EST, May 10. However, on the morning of May 11 convection flared up over the center, indicating that the cyclone might be acquiring tropical character once again. However, it did not.

The storm produced rough surf along the coastline from Florida to North Carolina, causing beach erosion and some damage. One surfer drowned in Florida from the rough surf. High winds from Andrea have been reported as fueling severe wildfires in northern Florida and southern Georgia. Andrea has been blamed for providing stiff winds that act like a "chimney", fueling the blaze to firestorm levels beyond the control of firefighting officials. Strong winds from the storm spread smoke from local brush fires through the Tampa Bay area to Miami.

From Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/2007_Atlantic_hurricane_season)


 
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