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HURRICANE GERT ADVISORY NUMBER  20
NATIONAL WEATHER SERVICE MIAMI FL
5 AM AST THU SEP 16 1999

...CATEGORY FOUR HURRICANE GERT MOVING WEST-NORTHWEST...
 
AT 5 AM AST...0900Z...THE CENTER OF HURRICANE GERT WAS LOCATED NEAR
LATITUDE 18.1 NORTH...LONGITUDE  52.2 WEST OR ABOUT 630 MILES...1010
KM...EAST OF THE NORTHERN LEEWARD ISLANDS.
 
GERT IS MOVING TOWARD THE WEST-NORTHWEST NEAR 10 MPH...17
KM/HR...AND THIS GENERAL MOTION IS EXPECTED TO CONTINUE FOR THE NEXT
24 HOURS.
 
AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT HAS JUST REACHED GERT
AND INDICATES THAT MAXIMUM SUSTAINED WINDS ARE NEAR 145 MPH...230
KM/HR...WITH HIGHER GUSTS.  SOME FLUCTUATIONS IN STRENGTH ARE
POSSIBLE DURING THE NEXT 24 HOURS.
 
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO  45 MILES... 75 KM...
FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP
TO 175 MILES...280 KM.
 
THE MINIMUM CENTRAL PRESSURE REPORTED BY THE HURRICANE HUNTER IS 
941 MB...27.79 INCHES.
 
REPEATING THE 5 AM AST POSITION...18.1 N... 52.2 W.  MOVEMENT
TOWARD...WEST NORTHWEST NEAR 10 MPH.  MAXIMUM SUSTAINED
WINDS...145 MPH.  MINIMUM CENTRAL PRESSURE... 941 MB.
 
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
11 AM AST.
 
BEVEN
 
STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE
FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC.
 
 
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