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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 843

NWS STORM PREDICTION CENTER NORMAN OK

610 PM EDT MON SEP 5 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME EAST CENTRAL GEORGIA

       SOUTH CENTRAL NORTH CAROLINA

       CENTRAL SOUTH CAROLINA



EFFECTIVE THIS MONDAY NIGHT FROM 610 PM UNTIL MIDNIGHT EDT.



HAIL TO 1 INCH 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 20 MILES NORTHEAST OF

SOUTHERN PINES NORTH CAROLINA TO 35 MILES SOUTHEAST 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...CONTINUE...WW 840...WW 841...WW 842...



DISCUSSION...A CLUSTER OF THUNDERSTORMS THAT FORMED NEAR THE

SAVANNAH RIVER WILL LIKELY PERSIST AND SPREAD GENERALLY NWD THROUGH

THE EVENING.  THESE STORMS WILL MOVE INTO AN AREA OF MODERATE

INSTABILITY /MLCAPE NEAR 1500 J PER KG/ AND SUBSTANTIAL DOWNDRAFT

POTENTIAL /DCAPE AOA 800 J PER KG/.  ADDITIONALLY...DEEP-LAYER MEAN

FLOW OF AROUND 35 KT WILL SUPPORT REASONABLE FAST COLD POOL

MOTION...AND AND ATTENDANT RISK FOR DAMAGING OUTFLOW WINDS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 20035.





...THOMPSON

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