

652 

WWUS20 KWNS 041858

SEL7

SPC WW 041858

NCZ000-VAZ000-CWZ000-050000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 327

NWS STORM PREDICTION CENTER NORMAN OK

255 PM EDT THU JUN 4 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME NORTHEASTERN NORTH CAROLINA

       FAR SOUTHERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

800 PM EDT.



TORNADOES...HAIL TO 1 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 30 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH NORTHWEST OF

DANVILLE VIRGINIA TO 30 MILES NORTHEAST OF ELIZABETH CITY NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...DEEP LAYER SHEAR AT 30-35 KT AND MODERATE INSTABILITY

WILL BE SUFFICIENT FOR ORGANIZED SEVERE STORMS THIS AFTERNOON...

MAINLY NEAR EAST-WEST ORIENTED FRONT STRETCHING ACROSS EXTREME

SOUTHERN VA. DESPITE ONLY 10 KT OF ENVIRONMENTAL LOW LEVEL SHEAR...A

VERY MOIST BOUNDARY LAYER...DEWPOINTS IN THE LOWER 70S...AND

ENHANCED SHEAR NEAR THE FRONTAL BOUNDARY WILL SUPPORT STORMS WITH

SUPERCELL CHARACTERISTICS. THE PRIMARY THREAT WILL BE BRIEF

TORNADOES AND WIND DAMAGE.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 27020.





...IMY

