

000 

WWUS20 KWNS 071532

SEL2

SPC WW 071532

ALZ000-GAZ000-NCZ000-SCZ000-TNZ000-072200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 812

NWS STORM PREDICTION CENTER NORMAN OK

1030 AM CDT THU AUG 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL ALABAMA

       NORTHERN AND CENTRAL GEORGIA

       EXTREME WESTERN NORTH CAROLINA

       EXTREME WESTERN SOUTH CAROLINA

       FAR SRN MIDDLE AND ERN TENNESSEE



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL

500 PM CDT.



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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST

OF HUNTSVILLE ALABAMA TO 10 MILES SOUTH SOUTHEAST OF ANDERSON

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...CLUSTER OF STORMS MOVING ESEWD ACROSS SRN TN/FAR NWRN

AL ARE EXPECTED TO INTENSIFY AS THEY MOVE INTO A WARMING AND

DESTABILIZING AIR MASS. POSSIBLE DEVELOPMENT OF A COLD POOL AND MID

LEVEL WLY WINDS INCREASING TO 30 KT SUGGESTS THAT WIND DAMAGE WILL

BE THE PRIMARY THREAT. ALSO...OTHER STORMS WITH SEVERE HAIL/WINDS

ARE EXPECTED TO DEVELOP THROUGH THE AFTERNOON AS A COLD FRONT MOVES

SLOWLY SWD INTO THE REGION.



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 550. MEAN STORM

MOTION VECTOR 29025.





...IMY

