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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 552

NWS STORM PREDICTION CENTER NORMAN OK

1215 PM CDT FRI AUG 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL ALABAMA

       CENTRAL MISSISSIPPI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1215 PM UNTIL

700 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH

SOUTHWEST OF GREENWOOD MISSISSIPPI TO 50 MILES NORTHEAST OF SELMA

ALABAMA.  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...DIFFERENTIAL HEATING ON THE S EDGE OF A CLOUD BAND

ACROSS NRN MS/AL WILL PROMOTE NEW THUNDERSTORM DEVELOPMENT THIS

AFTERNOON ACROSS CENTRAL MS/AL.  STRONG INSTABILITY IS ALREADY

PRESENT ACROSS THIS AREA /MLCAPE AOA 3000 J PER KG/...AND EFFECTIVE

BULK SHEAR OF 25-30 KT WILL SUPPORT A RISK FOR ORGANIZED MULTICELL

CLUSTERS CAPABLE OF PRODUCING DAMAGING DOWNBURST WINDS AND ISOLATED

LARGE HAIL THIS AFTERNOON.



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 36015.





...THOMPSON

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