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TROPICAL DEPRESSION SEVEN DISCUSSION NUMBER 9
NATIONAL WEATHER SERVICE MIAMI FL
11 PM EDT MON SEP 10 2001
LAST LIGHT VISIBLE IMAGERY DID NOT INSPIRE CONFIDENCE THAT THIS
SYSTEM HAS THE CIRCULATION OF A BONA FIDE TROPICAL CYCLONE...AND
NEITHER DID THE QUIKSCAT PASS VALID AT 21Z...WHICH BASICALLY SHOWED
A SHARP WSW-ENE ORIENTED TROUGH AXIS. THE SYSTEM IS PRODUCING
VIGOROUS CONVECTION...BUT IT IS WELL TO THE EAST OF WHATEVER CENTER
THE SYSTEM MAY HAVE. THE QUIKSCAT DID SHOW A COUPLE OF NON-FLAGGED
WIND VECTORS OF TROPICAL STORM FORCE...BUT I AM NOT PREPARED TO
UPGRADE A SYSTEM THAT I WOULD PREFER TO DOWNGRADE. IT IS
POSSIBLE...ALTHOUGH UNLIKELY...THAT YET ANOTHER CENTER COULD DEVELOP
FROM THE PERSISTENT CONVECTION...IN WHICH CASE WE WOULD HAVE A
TROPICAL STORM...BUT THE BEST COURSE FOR NOW IS TO MAINTAIN THE
STATUS QUO UNTIL VISIBLE IMAGERY IN THE MORNING.
THE FORECAST TRACK IS BASICALLY AN UPDATE OF THE PREVIOUS ADVISORY.
ALL THE LARGE SCALE MODELS SIGNIFICANTLY ERODE THE MID-LEVEL RIDGE
AHEAD OF THE DEPRESSION IN A DAY OR SO...AND MODEL GUIDANCE IS IN
GOOD AGREEMENT ON A SHARPLY RECURVING TRACK. THE OFFICIAL FORECAST
IS ON THE LEFT SIDE OF THE GUIDANCE ENVELOPE...WITH THE EXCEPTION OF
OF THE FSU SUPERENSEMBLE...WHICH HAS A 72 HOUR POSITION ABOUT 240 NM
WEST OF THE OFFICIAL FORECAST.
FORECASTER FRANKLIN
FORECAST POSITIONS AND MAX WINDS
INITIAL 11/0300Z 17.5N 47.3W 30 KTS
12HR VT 11/1200Z 18.0N 48.7W 30 KTS
24HR VT 12/0000Z 19.1N 50.1W 35 KTS
36HR VT 12/1200Z 20.2N 51.0W 40 KTS
48HR VT 13/0000Z 21.5N 51.5W 45 KTS
72HR VT 14/0000Z 24.5N 51.5W 55 KTS
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