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Tropical Storm JERRY Forecast Discussion Number 9
2013-10-01 04:45:56| National Hurricane Center (Atlantic)
Issued at 1100 PM AST MON SEP 30 2013 000 WTNT41 KNHC 010245 TCDAT1 TROPICAL STORM JERRY DISCUSSION NUMBER 9 NWS NATIONAL HURRICANE CENTER MIAMI FL AL112013 1100 PM AST MON SEP 30 2013 THE STRUCTURE OF JERRY HAS EVOLVED CONSIDERABLY DURING THE LAST SEVERAL HOURS. EARLIER TODAY THE CLOUD PATTERN RESEMBLED A SHEARED TROPICAL CYCLONE WITH DEEP CONVECTION MAINLY CONFINED TO THE EASTERN PORTION OF THE CIRCULATION. RECENTLY...BANDING FEATURES HAVE BECOME ESTABLISHED AND THE CLOUD PATTERN IS NOW MUCH MORE SYMMETRIC. THE INITIAL WIND SPEED IS INCREASED TO 45 KT BASED ON A DVORAK CLASSIFICATION FROM TAFB. THE SHEAR THAT HAS BEEN PLAGUING THE STORM DURING THE PAST COUPLE OF DAYS HAS APPARENTLY SLACKENED...GIVEN THE MORE SYMMETRIC STRUCTURE. HOWEVER...WATER VAPOR IMAGERY SHOWS STRONG WEST-NORTHWESTERLY UPPER-LEVEL WINDS AND DRIER AIR IMPINGING ON JERRY. THESE UNFAVORABLE CONDITIONS SHOULD LIMIT SIGNIFICANT ADDITIONAL INTENSIFICATION DURING THE NEXT FEW DAYS. AFTER 72 HOURS... WEAKENING SHOULD COMMENCE DUE TO EVEN STRONGER SHEAR. IT SHOULD BE NOTED THAT THIS INTENSITY FORECAST IS OF LOW CONFIDENCE SINCE THERE IS A LARGE SPREAD IN THE GUIDANCE RANGING FROM DISSIPATION WITHIN A FEW DAYS...AS SHOWN BY THE HWRF AND ECMWF MODELS...TO A HURRICANE AS INDICATED BY THE LGEM. JERRY IS STILL MOVING EASTWARD...BUT IT WILL SOON SLOW DOWN AND MEANDER WHEN IT BECOMES EMBEDDED IN VERY WEAK STEERING CURRENTS. A WESTWARD MOTION IS FORECAST TO BEGIN BY LATE TUESDAY FOLLOWED BY A NORTHWESTWARD MOTION ON WEDNESDAY WHEN SOME RIDGING BUILDS TO THE NORTH AND NORTHEAST OF THE STORM. AFTER THAT TIME...THE CYCLONE IS FORECAST TO RECURVE AHEAD OF AN APPROACHING TROUGH. THE NEW NHC TRACK FORECAST IS SHIFTED TO THE EAST OF THE PREVIOUS ONE BUT LIES TO THE WEST OF THE MULTI-MODEL CONSENSUS. FORECAST POSITIONS AND MAX WINDS INIT 01/0300Z 27.4N 43.8W 45 KT 50 MPH 12H 01/1200Z 27.2N 44.0W 50 KT 60 MPH 24H 02/0000Z 27.1N 44.9W 50 KT 60 MPH 36H 02/1200Z 27.3N 45.9W 50 KT 60 MPH 48H 03/0000Z 27.9N 46.8W 50 KT 60 MPH 72H 04/0000Z 29.0N 47.0W 50 KT 60 MPH 96H 05/0000Z 30.5N 45.0W 45 KT 50 MPH 120H 06/0000Z 33.0N 41.0W 40 KT 45 MPH $$ FORECASTER CANGIALOSI
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