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960 

WWUS20 KWNS 292234

SEL8

SPC WW 292234

DCZ000-KYZ000-MDZ000-PAZ000-VAZ000-WVZ000-CWZ000-300500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 438

NWS STORM PREDICTION CENTER NORMAN OK

635 PM EDT FRI JUN 29 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       EXTREME EASTERN KENTUCKY

       WESTERN MARYLAND

       SOUTHWEST PENNSYLVANIA

       MUCH OF VIRGINIA

       SOUTHERN AND EASTERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 635 PM

UNTIL 100 AM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH OF

PARKERSBURG WEST VIRGINIA TO 45 MILES NORTH NORTHEAST OF RICHMOND

VIRGINIA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 436...WW 437...



DISCUSSION...FAST MOVING AND DAMAGING DERECHO OVER OH HAS RESULTED

IN WIDESPREAD DAMAGING WINDS.  THIS SYSTEM WILL CONTINUE TO TRACK

EAST-SOUTHEASTWARD ACROSS THE WATCH AREA THIS EVENING.  STORMS MAY

LOSE SOME INTENSITY AS THEY MOVE ACROSS THE APPALACHIANS...BUT MOIST

AND VERY UNSTABLE AIR MASS OVER VA SUGGESTS THAT THREAT OF AT LEAST

SCATTERED SEVERE WIND GUSTS WILL CONTINUE.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 30045.





...HART

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