

187 

WWUS20 KWNS 180252

SEL3

SPC WW 180252

GAZ000-SCZ000-180700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 453

NWS STORM PREDICTION CENTER NORMAN OK

1055 PM EDT WED JUN 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST AND EAST CENTRAL GEORGIA

       WESTERN SOUTH CAROLINA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1055 PM

UNTIL 300 AM 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

ANDERSON SOUTH CAROLINA TO 40 MILES WEST SOUTHWEST OF AUGUSTA

GEORGIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 441. WATCH NUMBER 441 WILL NOT

BE IN EFFECT AFTER 1055 PM EDT. CONTINUE...WW 443...WW 445...WW

446...WW 447...WW 448...WW 449...WW 450...WW 451...WW 452...



DISCUSSION...A CLUSTER OF THUNDERSTORMS WILL CONTINUE TO DEVELOP

SSEWD ALONG AND W OF THE SAVANNAH RIVER.  THE ENVIRONMENT REMAINS

MODERATELY UNSTABLE IN ADVANCE OF THE ONGOING STORMS /DESPITE THE

LOSS OF DAYTIME HEATING/...AND DEEP LAYER NWLY SHEAR IS SUFFICIENT

FOR ORGANIZED MULTICELL CLUSTERS AND SOME EMBEDDED SUPERCELL/BOW

STRUCTURES.  DAMAGING WINDS AND LARGE HAIL WILL CONTINUE TO BE A

THREAT FOR THE NEXT FEW HOURS.



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 32020.





...THOMPSON

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