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ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN 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. NNNN