

000 

WWUS20 KWNS 201746

SEL9

SPC WW 201746

NCZ000-VAZ000-CWZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 209

NWS STORM PREDICTION CENTER NORMAN OK

145 PM EDT SUN APR 20 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF CENTRAL AND EASTERN NORTH CAROLINA

       PARTS OF SOUTHERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 800

PM EDT.



HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF

GREENSBORO NORTH CAROLINA TO 35 MILES EAST NORTHEAST OF ELIZABETH

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

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 INCREASE IN NUMBER AND INTENSITY

AHEAD OF THE UPPER LOW NOW MOVING EWD ACROSS CENTRAL APPALACHIANS.

WITH MLCAPES AOA 1000 J/KG...COOL/STEEP MID LEVEL LAPSE

RATES...LARGE HAIL EXPECTED TO BE PRIMARY THREAT WITH STRONGER

UPDRAFTS.  POTENTIAL FOR ISOLATED SUPERCELLS ERN PORTION OF WATCH

AREA WHERE LOW LEVEL SHEAR MORE FAVORABLE.  THIS WOULD ENHANCE

THREAT OF WIND DAMAGE AND LARGE HAIL.



AVIATION...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 19025.





...HALES

