ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN HURRICANE IVAN ADVISORY NUMBER 21 NATIONAL WEATHER SERVICE MIAMI FL 11 AM AST FRI SEP 25 1998 AT 11 AM AST...1500Z...THE CENTER OF HURRICANE IVAN WAS LOCATED NEAR LATITUDE 36.5 NORTH...LONGITUDE 40.6 WEST OR ABOUT 760 MILES...1220 KM...WEST OF THE AZORES ISLANDS. IVAN IS MOVING TOWARD THE NORTHEAST NEAR 18 MPH...30 KM/HR...AND THIS MOTION IS EXPECTED TO INCREASE IN SPEED AND BECOME MORE EASTWARD IN THE NEXT 24 HOURS. THIS TRACK WILL COULD HAVE HURRICANE IVAN SPREADING NEAR HURRICANE CONDITIONS THROUGH THE AZORES DURING THE NEXT 24 TO 36 HOURS. 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 11 AM AST POSITION...36.5 N... 40.6 W. MOVEMENT TOWARD...NORTHEAST NEAR 18 MPH. MAXIMUM SUSTAINED WINDS... 80 MPH. MINIMUM CENTRAL PRESSURE... 984 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 5 PM AST. GROSS STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN