Track: http://www.nhc.noaa.gov/refresh/graphics_at3+shtml/143253.shtml?3-daynl?large#contents HURRICANE GONZALO DISCUSSION NUMBER 29 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082014 1100 AM AST SUN OCT 19 2014 Despite traversing across sea-surface temperatures less than 10C, Gonzalo has been able to maintain convection near the center. A 0845 UTC AMSU overpass also revealed that Gonzalo still had a deep warm core that extended above the 200 mb level. Oil rigs in the southeastern quadrant have reported sustained hurricane-force winds during the past few hours, with oil rig VEP717 reporting a sustained wind of 85 kt more than 80 nmi from the center of Gonzalo. Since this report originated from a height of 130 meters, the initial intensity will remain at 75 kt for this advisory. The initial motion estimate is 055/45 kt. The global and regional models are in good agreement on Gonzalo turning east-northeastward during the next 12 hours or so, and then maintaining that motion over the far north Atlantic until the cyclone dissipates in 2-3 days. The official track forecast is close to a blend of the GFS and ECMWF models, and is near the latest forecast guidance from the NOAA Ocean Prediction Center. Gonzalo is expected to become extratropical later today, and gradually weaken during the next 24 to 36 hours. After that time, post-tropical Gonzalo is forecast to maintain storm-force winds over the north Atlantic until the cyclone dissipates. The NHC intensity forecast is based on guidance from the Ocean Prediction Center. FORECAST POSITIONS AND MAX WINDS INIT 19/1500Z 49.0N 47.3W 75 KT 85 MPH 12H 20/0000Z 52.0N 39.0W 65 KT 75 MPH...POST-TROP/EXTRATROP 24H 20/1200Z 54.5N 23.0W 55 KT 65 MPH...POST-TROP/EXTRATROP 36H 21/0000Z 57.0N 6.9W 50 KT 60 MPH...POST-TROP/EXTRATROP 48H 21/1200Z 62.1N 2.6W 50 KT 60 MPH...POST-TROP/EXTRATROP 72H 22/1200Z...DISSIPATED $$ Forecaster Stewart HURRICANE GONZALO ADVISORY NUMBER 29 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082014 1100 AM AST SUN OCT 19 2014 ...GONZALO REMAINS A HURRICANE OVER THE COLD WATERS OF THE FAR NORTH ATLANTIC... ...EXPECTED TO BECOME EXTRATROPICAL LATER TODAY... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...49.0N 47.3W ABOUT 265 MI...425 KM ENE OF ST. JOHNS NEWFOUNDLAND MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H PRESENT MOVEMENT...NE OR 55 DEGREES AT 52 MPH...83 KM/H MINIMUM CENTRAL PRESSURE...969 MB...28.62 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY... THE CANADIAN HURRICANE CENTRE HAS DISCONTINUED THE TROPICAL STORM WATCH FOR THE AVALON PENINSULA IN SOUTHEASTERN NEWFOUNDLAND. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ AT 1100 AM AST...1500 UTC...THE CENTER OF HURRICANE GONZALO WAS LOCATED NEAR LATITUDE 49.0 NORTH...LONGITUDE 47.3 WEST. GONZALO IS MOVING TOWARD THE NORTHEAST NEAR 52 MPH...83 KM/H...AND THIS MOTION IS EXPECTED TO CONTINUE TODAY. A TURN TOWARD THE EAST-NORTHEAST IS FORECAST TONIGHT...AND THIS MOTION IS EXPECTED TO CONTINUE THROUGH MONDAY NIGHT. GONZALO WILL CONTINUE TO MOVE QUICKLY AWAY FROM NEWFOUNDLAND TODAY...AND THEN RACE ACROSS THE OPEN NORTH ATLANTIC DURING THE NEXT COUPLE OF DAYS. MAXIMUM SUSTAINED WINDS REMAIN NEAR 85 MPH...140 KM/H...WITH HIGHER GUSTS. GRADUAL WEAKENING IS FORECAST DURING THE NEXT 48 HOURS...AND GONZALO IS EXPECTED TO BECOME EXTRATROPICAL LATER TODAY. HURRICANE-FORCE WINDS EXTEND OUTWARD UP TO 115 MILES...185 KM...FROM THE CENTER...AND TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 310 MILES...500 KM. THE LARGEST EXTENT OF TROPICAL-STORM-FORCE AND HURRICANE-FORCE WINDS IS TO THE SOUTH AND EAST OF THE CENTER...AND SOME OIL RIGS HAVE RECENTLY REPORTED SUSTAINED HURRICANE-FORCE WINDS WELL TO THE SOUTHEAST OF THE CENTER OF GONZALO. THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 969 MB...28.62 INCHES. HAZARDS AFFECTING LAND ---------------------- SURF...COASTAL FLOODING WILL BE POSSIBLE IN PORTIONS OF SOUTHERN NEWFOUNDLAND THIS MORNING...WITH CONDITIONS SUBSIDING THIS AFTERNOON. FOR MORE INFORMATION ON THIS THREAT...PLEASE SEE STATEMENTS FROM ENVIRONMENT CANADA. LARGE SWELLS GENERATED BY GONZALO WILL CONTINUE TO AFFECT PORTIONS OF THE VIRGIN ISLANDS...THE NORTHERN COASTS OF PUERTO RICO AND THE DOMINICAN REPUBLIC...PORTIONS OF THE BAHAMAS...PORTIONS OF THE UNITED STATES EAST COAST...BERMUDA...AND ATLANTIC CANADA THROUGH TODAY. THESE SWELLS WILL LIKELY CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS. FOR MORE INFORMATION...PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE. NEXT ADVISORY ------------- NEXT COMPLETE ADVISORY...500 PM AST. $$ FORECASTER STEWART |