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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 230

NWS STORM PREDICTION CENTER NORMAN OK

315 PM EDT FRI MAY 28 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MARYLAND PANHANDLE

       WESTERN VIRGINIA

       NORTHEASTERN WEST VIRGINIA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 315 PM UNTIL 900

PM EDT.



HAIL TO 1 INCH 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 EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHWEST OF MARTINSBURG WEST VIRGINIA TO 20 MILES SOUTH OF WHITE

SULPHUR SPRINGS WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE

WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 229...



DISCUSSION...STORMS HAVE DEVELOPED ALONG WEAK AREA OF CONVERGENCE

THAT STRETCHES FROM CENTRAL PA SWD ALONG THE WV/VA BORDER. AIR MASS

IS MODERATELY UNSTABLE AND SHEAR IS STRONG ENOUGH...20-25 KT...TO

SUSTAIN SWD MOVING ORGANIZED STORMS. THE DEGREE OF INSTABILITY WILL

SUPPORT SOME HAIL...WHILE RELATIVELY STEEP LOW LEVEL LAPSE RATES

WILL SUPPORT A DAMAGING WIND THREAT.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 02015.





...IMY

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