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#111379 (Received by flhurricane at: 10:40 AM 17.Sep.2006) TCPAT3 BULLETIN HURRICANE HELENE ADVISORY NUMBER 21 NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL082006 1100 AM AST SUN SEP 17 2006 ...HELENE STRENGTHENS...FORECAST TO REMAIN OVER WATER... AT 1100 AM AST...1500Z...THE CENTER OF HURRICANE HELENE WAS LOCATED NEAR LATITUDE 20.5 NORTH...LONGITUDE 49.0 WEST OR ABOUT 935 MILES... 1500 KM...EAST-NORTHEAST OF THE NORTHERN LEEWARD ISLANDS. HELENE IS MOVING TOWARD THE NORTHWEST NEAR 10 MPH...17 KM/HR...AND THIS MOTION IS EXPECTED TO CONTINUE TODAY WITH A GRADUAL TURN TO THE WEST-NORTHWEST ON MONDAY. MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 105 MPH...165 KM/HR...WITH HIGHER GUSTS. HELENE IS A STRONG CATEGORY TWO HURRICANE ON THE SAFFIR-SIMPSON HURRICANE SCALE. SOME ADDITIONAL STRENGTHENING IS POSSIBLE DURING THE NEXT 24 HOURS. HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 40 MILES...65 KM...FROM THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 175 MILES...280 KM. ESTIMATED MINIMUM CENTRAL PRESSURE IS 970 MB...28.64 INCHES. REPEATING THE 1100 AM AST POSITION...20.5 N...49.0 W. MOVEMENT TOWARD...NORTHWEST NEAR 10 MPH. MAXIMUM SUSTAINED WINDS...105 MPH. MINIMUM CENTRAL PRESSURE...970 MB. THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT 500 PM AST. $$ FORECASTER AVILA |