ZCZC MIATCPAT4 ALL TTAA00 KNHC DDHHMM BULLETIN TROPICAL STORM IVAN ADVISORY NUMBER 13 NATIONAL WEATHER SERVICE MIAMI FL 11 AM AST WED SEP 23 1998 AT 11 AM AST...1500Z...THE CENTER OF TROPICAL STORM IVAN WAS LOCATED NEAR LATITUDE 29.3 NORTH...LONGITUDE 39.6 WEST OR ABOUT 905 MILES...1455 KM...SOUTHWEST OF THE AZORES ISLANDS. IVAN IS MOVING TOWARD THE NORTH NORTHWEST NEAR 18 MPH...30 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE THROUGH TONIGHT. MAXIMUM SUSTAINED WINDS ARE NEAR 50 MPH... 85 KM/HR...WITH HIGHER GUSTS. SOME STRENGTHENING IS POSSIBLE FORECAST DURING THE NEXT 24 HOURS. TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 200 MILES...325 KM FROM THE CENTER. ESTIMATED MINIMUM CENTRAL PRESSURE IS 997 MB...29.44 INCHES. REPEATING THE 11 AM AST POSITION...29.3 N... 39.6 W. MOVEMENT TOWARD...NORTH NORTHWEST NEAR 18 MPH. MAXIMUM SUSTAINED WINDS... 50 MPH. MINIMUM CENTRAL PRESSURE... 997 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 5 PM AST. RAPPAPORT STRIKE PROBABILITIES ASSOCIATED WITH THIS ADVISORY NUMBER CAN BE FOUND UNDER AFOS HEADER MIASPFAT4 AND WMO HEADER WTNT74 KNHC. NNNN