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WWUS20 KWNS 081748

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DCZ000-DEZ000-KYZ000-MDZ000-OHZ000-VAZ000-WVZ000-CWZ000-090200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 481

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT SUN JUL 8 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       DELAWARE

       EXTREME NORTHEAST KENTUCKY

       MARYLAND

       EXTREME SOUTHEAST OHIO

       NORTHERN AND CENTRAL VIRGINIA

       WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 145 PM UNTIL

1000 PM EDT.



HAIL TO 2 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 EITHER SIDE OF A LINE FROM 45 MILES WEST SOUTHWEST

OF CHARLESTON WEST VIRGINIA TO 35 MILES NORTHEAST OF SALISBURY

MARYLAND.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...STORMS ARE DEVELOPING ALONG A COLD FRONT FROM SERN OH

INTO NRN MD AS IT MOVES SEWD INTO A MOIST AND VERY UNSTABLE

ENVIRONMENT.  TEMPERATURES ARE IN THE MID 90S TO AROUND 100F AHEAD

OF THE FRONT RESULTING IN STEEP LOW LEVEL LAPSE RATES WHICH WILL

ENHANCE THREAT FOR DAMAGING WIND GUSTS.  IN ADDITION...LARGE

INSTABILITY INDICATES POTENTIAL FOR STORMS TO PRODUCE LARGE HAIL.

ACTIVITY IS EXPECTED TO CONTINUING DEVELOPING AND MOVE ESEWD THIS

AFTERNOON INTO THE EVENING.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 28020.





...WEISS

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