ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN TROPICAL STORM IVAN ADVISORY NUMBER 12 NATIONAL WEATHER SERVICE MIAMI FL 5 AM AST WED SEP 23 1998 ...IVAN CONTINUES ON NORTH-NORTHWEST COURSE... AT 5 AM AST...0900Z...THE CENTER OF TROPICAL STORM IVAN WAS LOCATED NEAR LATITUDE 27.3 NORTH...LONGITUDE 38.1 WEST OR ABOUT 930 MILES...1500 KM...SOUTH-SOUTHWEST OF AZORES ISLANDS. IVAN IS MOVING TOWARD THE NORTH NORTHWEST NEAR 15 MPH ...24 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE THROUGH WESNESDAY. MAXIMUM SUSTAINED WINDS ARE NEAR 50 MPH... 85 KM/HR...WITH HIGHER GUSTS. LITTLE CHANGE IN STRENGTH IS FORECAST DURING THE NEXT 24 HOURS. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 115 MILES ...185 KM FROM THE CENTER. ESTIMATED MINIMUM CENTRAL PRESSURE IS 997 MB...29.44 INCHES. REPEATING THE 5 AM AST POSITION...27.3 N... 38.1 W. MOVEMENT TOWARD...NORTH NORTHWEST NEAR 15 MPH. MAXIMUM SUSTAINED WINDS... 50 MPH. MINIMUM CENTRAL PRESSURE... 997 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 11 AM AST. JARVINEN STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN