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375 

WWUS20 KWNS 241911

SEL8

SPC WW 241911

MDZ000-NCZ000-TNZ000-VAZ000-WVZ000-CWZ000-250200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 408

NWS STORM PREDICTION CENTER NORMAN OK

310 PM EDT THU JUN 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       FAR NORTHWEST NORTH CAROLINA

       FAR NORTHEAST TENNESSEE

       CENTRAL...SOUTH CENTRAL...AND SOUTHWEST VIRGINIA

       FAR SOUTHERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

1000 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 165

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

RICHMOND VIRGINIA TO 10 MILES WEST SOUTHWEST OF BRISTOL

TENNESSEE.  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 404...WW 405...WW

406...WW 407...



DISCUSSION...STRONG/SVR COLD FRONTAL TSTMS NOW OVER THE WV MOUNTAINS

EXPECTED TO MOVE/DEVELOP GENERALLY ESE THROUGH AT LEAST EARLY EVE.

WHILE DEEP WNWLY SHEAR DIMINISHES WITH SWD EXTENT...WEAKLY

CONVERGENT PRE-FRONTAL FLOW...PRESENCE OF TCU OVER AND E OF THE

MOUNTAINS ...AND STEEP LOW LVL LAPSE RATE ENVIRONMENT E OF THE

MOUNTAINS SUGGEST POTENTIAL FOR DMGG WIND GUSTS AND PERHAPS

MARGINALLY SVR HAIL.



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 29030.





...CORFIDI

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