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HURRICANE FLOYD INTERMEDIATE ADVISORY NUMBER  21A
NATIONAL WEATHER SERVICE MIAMI FL
8 PM AST SUN SEP 12 1999

...EXTREMELY DANGEROUS HURRICANE FLOYD HEADING TOWARD THE BAHAMAS...
 
A HURRICANE WARNING IS IN EFFECT FOR THE CENTRAL BAHAMAS...INCLUDING
CAT ISLAND...EXUMAS ISLANDS...LONG ISLAND...RUM CAY...AND SAN
SALVADOR ISLAND.
 
A HURRICANE WATCH IS IN EFFECT FOR THE NORTHWEST BAHAMAS...INCLUDING
THE ABACO ISLANDS...ANDROS ISLAND...BERRY ISLANDS...BIMINI...
ELEUTHERA...GRAND BAHAMA AND NEW PROVIDENCE ISLAND.
 
A TROPICAL STORM WARNING IS IN EFFECT FOR THE TURKS AND CAICOS
ISLANDS AND THE SOUTHEASTERN BAHAMAS.
 
A HURRICANE WATCH MAY BE REQUIRED FOR A PORTION OF THE FLORIDA EAST
COAST LATER TONIGHT OR EARLY ON MONDAY.
 
INTERESTS IN THE SOUTHEAST U.S. SHOULD MONITOR THE PROGRESS OF THIS
HURRICANE.
 
AT 8 PM AST...0000Z...THE CENTER OF HURRICANE FLOYD WAS LOCATED NEAR
LATITUDE 23.5 NORTH...LONGITUDE  68.7 WEST OR ABOUT 370 MILES...595
KM...EAST OF SAN SALVADOR IN THE CENTRAL BAHAMAS.
 
FLOYD IS MOVING JUST NORTH OF DUE WEST NEAR 14 MPH...22 KM/HR...AND
THIS GENERAL MOTION IS EXPECTED TO CONTINUE TONIGHT.
 
MAXIMUM SUSTAINED WINDS HAVE INCREASED TO 145 MPH...235 KM/HR...WITH
HIGHER GUSTS.  THIS MAKES FLOYD A CATEGORY FOUR HURRICANE ON
THE SAFFIR/SIMPSON HURRICANE SCALE.  SOME FLUCTUATIONS IN STRENGTH
ARE POSSIBLE DURING THE NEXT 24 HOURS.
 
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 115 MILES...185 KM...
FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP
TO 290 MILES...465 KM.
 
AN AIR FORCE HURRICANE HUNTER PLANE REPORTED THAT THE MINIMUM
CENTRAL PRESSURE HAS FALLEN TO 932 MB...27.52 INCHES.
 
STORM SURGE FLOODING OF 10 TO 15 FEET ABOVE NORMAL TIDE
LEVELS...WITH LARGE BATTERING WAVES...IS POSSIBLE IN THE HURRICANE
WARNING AREA.  

REPEATING THE 8 PM AST POSITION...23.5 N... 68.7 W.  MOVEMENT
TOWARD...WEST NEAR 14 MPH.  MAXIMUM SUSTAINED WINDS...145 MPH. 
MINIMUM CENTRAL PRESSURE... 932 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE
 CENTER AT 11 PM AST.
 
JARVINEN
 
 
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