

000 

WWUS20 KWNS 281903

SEL0

SPC WW 281903

NCZ000-VAZ000-WVZ000-CWZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 80

NWS STORM PREDICTION CENTER NORMAN OK

300 PM EDT WED MAR 28 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND EASTERN NORTH CAROLINA

       SOUTHWEST VIRGINIA

       EXTREME SOUTHEAST WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 300 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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHWEST OF BLUEFIELD WEST VIRGINIA TO 5 MILES SOUTHEAST OF CAPE

HATTERAS NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...THUNDERSTORMS WILL LIKELY INCREASE IN

COVERAGE/INTENSITY ALONG WNW-ESE ORIENTED SURFACE FRONT FROM SW VA

INTO ERN NC THROUGH THE AFTERNOON.  CONVECTIVE COVERAGE WILL BE

ENHANCED BY LARGER SCALE ASCENT ACCOMPANYING THE REMNANTS OF A SRN

STREAM SHORTWAVE TROUGH IS NOW APPROACHING THE APPALACHIANS FROM THE

W.  WARM SURFACE TEMPERATURES AND A DEEP MIXED LAYER MAY PROMOTE

ISOLATED DOWNBURSTS WITH THE STRONGER STORMS...WHILE LARGE HAIL

SHOULD BE THE MAIN THREAT WITH STORMS ALONG THE BOUNDARY/MODERATE

INSTABILITY AXIS.



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 450. MEAN STORM

MOTION VECTOR 29015.





...THOMPSON

