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WWUS20 KWNS 272359

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 812

NWS STORM PREDICTION CENTER NORMAN OK

755 PM EDT SAT AUG 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWESTERN CONNECTICUT

       SOUTHERN DELAWARE

       EASTERN NEW JERSEY

       FAR SOUTHEASTERN NEW YORK AND LONG ISLAND

       COASTAL WATERS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 755 PM

UNTIL 500 AM EDT.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH SOUTHEAST OF

DOVER DELAWARE TO 15 MILES EAST NORTHEAST OF BRIDGEPORT

CONNECTICUT.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 811. WATCH NUMBER 811 WILL NOT BE IN EFFECT AFTER

755 PM EDT.



DISCUSSION...HRCN IRENE EXPECTED TO CONTINUE SLOWLY NNEWD THROUGH

EARLY SUN.  SATELLITE AND THERMAL CONSIDERATIONS SUGGEST THAT THE

SYSTEM IS BEGINNING TO UNDERGO EXTRATROPICAL TRANSITION.  COUPLED

WITH THE FACT THAT THE CIRCULATION CENTER HAS NOW MOVED BACK OVER

OPEN WATER...ASSOCIATED WIND FIELD EXPECTED TO REMAIN AMPLY STRONG

TO SUPPORT LOW LVL ROTATION IN SEMI-DISCRETE SHOWERS/TSTMS FORMING

WITHIN AXIS OF WEAK SFC-BASED INSTABILITY ARCING NW FROM THE

ATLANTIC INTO THE NE QUADRANT OF THE SYSTEM.  THE GREATEST TORNADO

RISK IN THE NEAR TERM APPEARS TO BE ALONG THE SRN JERSEY SHORE AND

OVER LWR DE BAY.  THE THREAT SHOULD EDGE NWD INTO CNTRL NJ AND INTO

THE NYC AREA/SRN LONG ISLAND LATER TNGT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

400. MEAN STORM MOTION VECTOR 12040.





...CORFIDI

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