

000 

WWUS20 KWNS 201711

SEL7

SPC WW 201711

NCZ000-VAZ000-CWZ000-210000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 327

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT TUE MAY 20 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A LARGE PART OF CENTRAL AND NORTHEASTERN NORTH CAROLINA

       PARTS OF SOUTHERN AND SOUTHEASTERN VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 110 PM UNTIL

800 PM EDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

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

NORTHEAST OF NORFOLK VIRGINIA TO 15 MILES SOUTH SOUTHWEST OF

HICKORY 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...STRONG WESTERLY WIND FIELDS ACROSS MID ATLANTIC STATES

WITH STEEP MID LEVEL LAPSE RATES IN PLACE.  AIRMASS IS BECOMING

MDTLY UNSTABLE AS HEATING WEAKENS CONVECTIVE INHIBITION E OF SRN

APPALACHIANS.  SEVERE THUNDERSTORMS WILL DEVELOP EWD FROM

APPALACHIANS AND FORM IN TO SHORT LINES/BOWS WITH PRIMARILY THREAT

OF WIND DAMAGE AND LARGE HAIL.  SUPERCELLS WILL BE POSSIBLE AS

STORMS MOVE INTO MORE UNSTABLE AIR SERN VA/NERN NC DURING AFTERNOON.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26045.





...HALES

