

566 

WWUS20 KWNS 041628

SEL9

SPC WW 041628

VAZ000-CWZ000-042200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 239

NWS STORM PREDICTION CENTER NORMAN OK

1230 PM EDT MON MAY 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1230 PM UNTIL

600 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 130 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF SOUTH HILL

VIRGINIA TO 30 MILES EAST SOUTHEAST OF SOUTH HILL VIRGINIA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 238...



DISCUSSION...RAPID DESTABILIZATION HAS OCCURRED ALONG STRONG WARM

FRONT AND AHEAD OF VORT MAX CROSSING THE APPALACHIANS. EXPECT TSTMS

TO INCREASE FROM SOUTH OF THE BLUE RIDGE TO THE TIDEWATER THROUGH

THE AFTERNOON. STRONG EFFECTIVE SHEAR OF UP TO 50KT ACROSS THIS

REGION WILL SUPPORT SUPERCELLS WITH SOME TORNADIC POTENTIAL ALONG

THE WARM FRONT AND AHEAD OF SURFACE WAVE RIPPLING EAST ALONG THE

FRONT. STORMS CROSSING TO THE COOL SIDE OF THE BOUNDARY WILL EXIST

IN AN ENVIRONMENT WITH STEEP LAPSE RATES AND SUFFICIENT EFFECTIVE

SHEAR FOR HAIL PRODUCTION.



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

450. MEAN STORM MOTION VECTOR 26030.





...CARBIN

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