

789 

WWUS20 KWNS 222137

SEL0

SPC WW 222137

GAZ000-NCZ000-SCZ000-230300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 540

NWS STORM PREDICTION CENTER NORMAN OK

540 PM EDT WED JUN 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHEAST GEORGIA

       WESTERN NORTH CAROLINA

       UPSTATE SOUTH CAROLINA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 540 PM UNTIL

1100 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 55

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES WEST OF

ANDERSON SOUTH CAROLINA TO 10 MILES NORTHEAST OF HICKORY 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.



OTHER WATCH INFORMATION...CONTINUE...WW 538...WW 539...



DISCUSSION...MULTICELL CLUSTER IN NE GA WILL LIKELY PERSIST AND

MOVE/DEVELOP NEWD INTO SC DURING THE NEXT FEW HOURS.  MODERATE

INSTABILITY...STEEP LOW-LEVEL LAPSE RATES...AND 25-30 KT MIDLEVEL

FLOW WILL HELP MAINTAIN A RISK FOR DAMAGING WINDS AND MARGINALLY

SEVERE HAIL WITH THE STRONGER STORMS.  CONVECTION IS EXPECTED TO

WEAKEN SOON AFTER SUNSET AS THE BOUNDARY LAYER COOLS.



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 500. MEAN STORM

MOTION VECTOR 23035.





...THOMPSON

