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Posted by
Chris in Tampa on 8/16/2009, 5:02 am
TROPICAL DEPRESSION FOUR DISCUSSION NUMBER 1
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL042009
500 AM EDT SUN AUG 16 2009
DATA FROM THE WFO TAMPA RADAR INDICATE THAT THE DISTURBANCE IN THE
EASTERN GULF OF MEXICO HAS BECOME SIGNIFICANTLY BETTER ORGANIZED
OVERNIGHT. A QUIKSCAT PASS NEAR 00Z SUGGESTED THAT THERE PROBABLY
WAS A CLOSED SURFACE CIRCULATION. GIVEN THIS...ADVISORIES ARE BEING
INITIATED ON A NEW TROPICAL DEPRESSION. ALTHOUGH THERE WAS A SHIP
REPORT FROM A CARNIVAL CRUISE LINE VESSEL OF 40 KT...THIS REPORT IS
NOT CONSIDERED TO BE REPRESENTATIVE OF THE SURFACE WINDS. DOPPLER
VELOCITIES FROM THE TAMPA RADAR ALSO DO NOT SUPPORT TROPICAL STORM
STRENGTH AT THIS TIME. HOWEVER...THE EXCELLENT RADAR PRESENTATION
AND DEEP CONVECTION SUGGESTS THAT STORM STATUS IS LIKELY TO BE
ATTAINED SOON. VERTICAL SHEAR IS VERY LOW...AND THE INTENSITY
GUIDANCE FROM THE HWRF AND GFDL SUGGEST A MIDDLE-RANGE TROPICAL
STORM BY LANDFALL. IT SHOULD BE NOTED THAT SOME ADDITIONAL
STRENGTHENING PRIOR TO LANDFALL BUT AFTER THE 12 HOUR 45 KT
FORECAST INTENSITY SHOWN BELOW IS LIKELY.
THE INITIAL MOTION IS 330/13. THE CYCLONE IS MOVING AROUND THE
PERIPHERY OF THE SUBTROPICAL RIDGE AND IS EXPECTED TO MAINTAIN THIS
APPROXIMATE TRACK UNTIL LANDFALL. THE OFFICIAL FORECAST IS CLOSE TO
A CONSENSUS OF A FAIRLY TIGHTLY CLUSTERED GUIDANCE SUITE.
THIS IS A VERY SMALL TROPICAL CYCLONE...AND ITS EFFECTS ARE LIKELY
TO REMAIN RATHER CLOSE TO THE PATH OF THE CENTER.
FORECAST POSITIONS AND MAX WINDS
INITIAL 16/0900Z 27.7N 83.9W 30 KT
12HR VT 16/1800Z 29.2N 85.0W 45 KT
24HR VT 17/0600Z 31.0N 86.7W 40 KT...INLAND
36HR VT 17/1800Z 33.0N 87.5W 20 KT...DISSIPATING INLAND
48HR VT 18/0600Z...DISSIPATED |
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