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ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN HURRICANE GERT ADVISORY NUMBER 24 NATIONAL WEATHER SERVICE MIAMI FL 5 AM AST FRI SEP 17 1999 ...GERT SLIGHTLY STRONGER...CONTINUING WEST-NORTHWEST... INTERESTS IN BERMUDA SHOULD MONITOR THE PROGRESS OF GERT OVER THE WEEKEND. AT 5 AM AST...0900Z...THE CENTER OF HURRICANE GERT WAS LOCATED NEAR LATITUDE 19.7 NORTH...LONGITUDE 55.7 WEST OR ABOUT 1040 MILES... 1670 KM...SOUTH-SOUTHEAST OF BERMUDA. GERT IS MOVING TOWARD THE WEST-NORTHWEST NEAR 10 MPH...17 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE THROUGH TONIGHT. MAXIMUM SUSTAINED WINDS ARE NOW NEAR 140 MPH...220 KM/HR...WITH HIGHER GUSTS. SOME FLUCTUATIONS IN STRENGTH ARE POSSIBLE DURING THE NEXT 24 HOURS. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 120 MILES...195 KM... FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 230 MILES...370 KM. THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT IS 942 MB...27.82 INCHES. REPEATING THE 5 AM AST POSITION...19.7 N... 55.7 W. MOVEMENT TOWARD...WEST NORTHWEST NEAR 10 MPH. MAXIMUM SUSTAINED WINDS...140 MPH. MINIMUM CENTRAL PRESSURE... 942 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