

940 

WWUS20 KWNS 101921

SEL9

SPC WW 101921

NCZ000-SCZ000-TNZ000-VAZ000-WVZ000-CWZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 269

NWS STORM PREDICTION CENTER NORMAN OK

320 PM EDT TUE MAY 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF WESTERN NORTH CAROLINA

       MUCH OF SOUTH CAROLINA

       MUCH OF EASTERN TENNESSEE

       PARTS OF WESTERN VIRGINIA

       PARTS OF SOUTHERN WEST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

1100 PM EDT.



HAIL TO 3.5 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 85

STATUTE MILES EITHER SIDE OF A LINE FROM 40 MILES NORTHWEST OF

BRISTOL TENNESSEE TO 25 MILES EAST SOUTHEAST OF MYRTLE BEACH

SOUTH 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.



OTHER WATCH INFORMATION...CONTINUE...WW 268...



DISCUSSION...THUNDERSTORMS WILL INCREASE BOTH FROM THE W-NW ACROSS

THE APPALACHIANS AND NEARER THE COAST AS AIR MASS HAS BECOME

STRONGLY UNSTABLE THIS AFTERNOON.  WITH 40-50 KT OF DEEP LAYER

SHEAR...COUPLED WITH STEEP MID LEVEL LAPSE RATES...VERY LARGE HAIL

WILL ACCOMPANY MANY OF THE STRONGEST STORMS INCLUDING A FEW

SUPERCELLS.  DAMAGING WINDS WILL BE ASSOCIATED WITH UPSCALE

DEVELOPMENT LATER THIS AFTERNOON OF STORMS INTO SHORT LINE SEGMENTS

AND CLUSTERS AS THEY MOVE SEWD THRU THE WATCH.



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

TO 3.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 30025.





...HALES

