ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN HURRICANE IVAN ADVISORY NUMBER 18 NATIONAL WEATHER SERVICE MIAMI FL 5 PM AST THU SEP 24 1998 ...IVAN MOVING NORTHWARD... AT 5 PM AST...2100Z...THE CENTER OF HURRICANE IVAN WAS LOCATED NEAR LATITUDE 34.0 NORTH...LONGITUDE 42.4 WEST OR ABOUT 840 MILES ...1350 KM...WEST-SOUTHWEST OF THE AZORES ISLANDS. IVAN IS MOVING TOWARD THE NORTH NEAR 14 MPH...22 KM/HR. A GRADUAL TURN TOWARD THE NORTH-NORTHEAST AND THEN THE NORTHEAST IS EXPECTED ON FRIDAY. MAXIMUM SUSTAINED WINDS ARE NEAR 80 MPH...130 KM/HR...WITH HIGHER GUSTS. LITTLE CHANGE IN STRENGTH IS FORECAST DURING THE NEXT 24 HOURS. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 30 MILES... 45 KM... FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 115 MILES...185 KM. ESTIMATED MINIMUM CENTRAL PRESSURE IS 984 MB...29.06 INCHES. REPEATING THE 5 PM AST POSITION...34.0 N... 42.4 W. MOVEMENT TOWARD...NORTH NEAR 14 MPH. MAXIMUM SUSTAINED WINDS... 80 MPH. MINIMUM CENTRAL PRESSURE... 984 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 11 PM AST. RAPPAPORT STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN