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176 

WWUS20 KWNS 111939

SEL8

SPC WW 111939

NJZ000-NYZ000-PAZ000-CWZ000-120200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 698

NWS STORM PREDICTION CENTER NORMAN OK

340 PM EDT MON OCT 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF NEW JERSEY

       PARTS OF SOUTHEAST NEW YORK

       MUCH OF EASTERN PENNSYLVANIA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 340 PM UNTIL

1000 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST

SOUTHWEST OF WILLIAMSPORT PENNSYLVANIA TO 25 MILES SOUTH

SOUTHEAST OF NEW YORK CITY NEW YORK.  FOR A COMPLETE DEPICTION OF

THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS

WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...THUNDERSTORMS HAVE DEVELOP CENTRAL PA WITHIN A MDTLY

SHEARED...STEEP LAPSE RATE ENVIRONMENT.  SUFFICIENT INSTABILITY FOR

STORMS TO DEVELOP INTO SHORT LINE SEGMENTS/BOWS WITH RESULTANT COLD

POOLS AND DAMAGING WINDS.  ACTIVITY WILL CONTINUE RAPIDLY ESEWD THRU

THE WATCH WHERE FAVORABLE CONDITIONS ARE AVAILABLE TO THE COAST.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 27035.





...HALES

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