

000 

WWUS20 KWNS 271602

SEL7

SPC WW 271602

MDZ000-NCZ000-VAZ000-CWZ000-272300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 197

NWS STORM PREDICTION CENTER NORMAN OK

1200 PM EDT FRI APR 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN SHORE OF MARYLAND

       EASTERN NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM NOON UNTIL 700

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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH

NORTHWEST OF WALLOPS VIRGINIA TO 25 MILES WEST OF JACKSONVILLE

NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...SCATTERED THUNDERSTORMS WILL LIKELY INCREASE IN

COVERAGE/INTENSITY THIS AFTERNOON AS THE LOW LEVELS DESTABILIZE AND

A WEAK SHORTWAVE TROUGH APPROACHES NC/VA FROM SC.  THE COMBINATION

OF MODERATE INSTABILITY AND LARGELY UNIDIRECTIONAL WIND PROFILES

WILL SUPPORT BOTH BOWING SEGMENTS AND MORE ISOLATED SUPERCELLS.

DAMAGING WINDS SHOULD BE THE MAIN SEVERE THREAT...WHILE LARGE HAIL

WILL ALSO BE POSSIBLE WITH THE STRONGEST STORMS.



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 24035.





...THOMPSON

