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017 

WWUS20 KWNS 121821

SEL4

SPC WW 121821

MDZ000-VAZ000-WVZ000-CWZ000-130000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 154

NWS STORM PREDICTION CENTER NORMAN OK

220 PM EDT WED MAY 12 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       VIRGINIA

       EXTREME ERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 220 PM UNTIL

800 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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHEAST OF

CHARLOTTESVILLE VIRGINIA TO 45 MILES SOUTH OF LYNCHBURG VIRGINIA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...ORGANIZED MCS EXPECTED TO INTENSIFY AS IT MOVES INTO

DESTABILIZING ATMOSPHERE ACROSS VA. MID-LEVEL JET ATTENDING AN MCS

WILL MIGRATE EWD THROUGH VA THIS AFTERNOON AND MAINTAIN VERTICAL

WIND PROFILES SUFFICIENT FOR ORGANIZED STORMS INCLUDING LEWP

STRUCTURES. DAMAGING WIND IS EXPECTED TO BE THE MAIN THREAT...THOUGH

SOME HAIL MAY ALSO ACCOMPANY THE STRONGER STORMS.



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 28035.





...DIAL

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