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WWUS20 KWNS 311907

SEL3

SPC WW 311907

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 403

NWS STORM PREDICTION CENTER NORMAN OK

310 PM EDT SAT MAY 31 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       VIRGINIA

       PART OF THE EASTERN WEST VIRGINIA PANHANDLE

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

900 PM EDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF STAUNTON

VIRGINIA TO 10 MILES SOUTH SOUTHEAST OF WALLOPS VIRGINIA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 402...



DISCUSSION...HEIGHT FALLS/ASCENT ASSOCIATED WITH STRONG UPPER TROUGH

MOVING ACROSS THE ERN GREAT LAKES WILL INCREASE THUNDERSTORMS OVER

THIS REGION THIS EVENING AS TROUGH SHIFTS EWD.  AIR MASS IS VERY

UNSTABLE SOUTH OF OUTFLOW BOUNDARY NOW PUSHING INTO FAR NRN VA/NERN

MD/DE WITH MLCAPES AOA 2000 J/KG.  GIVEN STRONG DEEP LAYER

SHEAR...EXPECT ACTIVITY WILL ORGANIZE INTO LINES/SUPERCELLS WITH

THREATS OF LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 28035.





...EVANS

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