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WWUS20 KWNS 010844

SEL2

SPC WW 010844

DCZ000-MDZ000-VAZ000-WVZ000-CWZ000-011500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 762

NWS STORM PREDICTION CENTER NORMAN OK

345 AM EST WED DEC 1 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       DISTRICT OF COLUMBIA

       CENTRAL AND SOUTHERN MARYLAND

       NORTHERN VIRGINIA

       FAR EASTERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY MORNING FROM 345 AM UNTIL 1000 AM EST.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF

BALTIMORE MARYLAND TO 50 MILES EAST OF CHARLOTTESVILLE VIRGINIA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 760...WW 761...



DISCUSSION...LOW-TOPPED CONVECTION NOW PRESENT NEAR CNTRL VA SFC LOW

EXPECTED TO MOVE/DEVELOP RAPIDLY NNEWD IN ENVIRONMENT OF VERY WEAK

BUOYANCY BUT VERY STRONG LOW LVL SHEAR.  MAIN SVR THREAT LIKELY WILL

BE ISOLD DMGG WIND FROM SMALL BOWS...BUT A SHORT-LIVED TORNADO OR

TWO CANNOT BE RULED OUT...MAINLY NEAR/E OF SFC LOW.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

300. MEAN STORM MOTION VECTOR 22050.





...CORFIDI

