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2OO7 ATLANTIC HURRICANE SEASON |
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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).
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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