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ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN HURRICANE GERT ADVISORY NUMBER 14 NATIONAL WEATHER SERVICE MIAMI FL 5 PM AST TUE SEP 14 1999 ...GERT BECOMES THE FOURTH MAJOR HURRICANE OF THE 1999 ATLANTIC HURRICANE SEASON... AT 5 PM AST...2100Z...THE CENTER OF HURRICANE GERT WAS LOCATED NEAR LATITUDE 17.2 NORTH...LONGITUDE 46.5 WEST OR ABOUT 990 MILES...1590 KM...EAST OF THE LESSER ANTILLES. GERT IS MOVING TOWARD THE WEST NEAR 16 MPH...26 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE FOR THE NEXT 24 HOURS. MAXIMUM SUSTAINED WINDS HAVE INCREASED AND ARE NOW NEAR 115 MPH...185 KM/HR...WITH HIGHER GUSTS. THIS MAKES GERT A CATEGORY THREE HURRICANE ON THE SAFFIR-SIMPSON HURRICANE SCALE. SOME ADDITIONAL STRENGTHENING IS EXPECTED DURING THE NEXT 24 HOURS. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 35 MILES... 55 KM... FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 140 MILES...220 KM. ESTIMATED MINIMUM CENTRAL PRESSURE IS 960 MB...28.35 INCHES. REPEATING THE 5 PM AST POSITION...17.2 N... 46.5 W. MOVEMENT TOWARD...WEST NEAR 16 MPH. MAXIMUM SUSTAINED WINDS...115 MPH. MINIMUM CENTRAL PRESSURE... 960 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 11 PM AST. FRANKLIN STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN