

088 

WWUS20 KWNS 202256 CCA

SEL3

SPC WW 202256 CCA

MDZ000-NYZ000-PAZ000-WVZ000-LEZ000-LOZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 723...CORRECTED

NWS STORM PREDICTION CENTER NORMAN OK

705 PM EDT THU AUG 20 2009



CORRECTED FOR ENDING TIME



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR WESTERN MARYLAND

       WESTERN NEW YORK

       WESTERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA

       LAKE ERIE

       LAKE ONTARIO



EFFECTIVE THIS THURSDAY NIGHT FROM 705 PM UNTIL MIDNIGHT 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH

SOUTHEAST OF MORGANTOWN WEST VIRGINIA TO 45 MILES NORTH NORTHWEST

OF ROCHESTER NEW YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 721...WW 722...



DISCUSSION...ERN OH QLCS EXPECTED TO CONTINUE ENE INTO WRN

PA/NY...WHERE DEEP SHEAR SHOULD REMAIN SUFFICIENT FOR EMBEDDED

SUSTAINED STORMS/LEWPS AND SMALL SCALE BOWS WITH DMGG WIND.  AHEAD

OF LINE...WEAKLY CONFLUENT LOW LVL SWLY FLOW MAY CONTINUE TO SUPPORT

DEVELOPMENT OF ISOLD STORMS THAT...GIVEN ENVIRONMENTAL SHEAR AND

MOISTURE...COULD EVOLVE INTO SMALL SUPERCELLS POSING A THREAT FOR

LOCALLY DMGG WIND...MARGINALLY SVR HAIL...AND POSSIBLY AN ISOLD

TORNADO.



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 500. MEAN STORM

MOTION VECTOR 23030.





...CORFIDI

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