SEL8 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 358 NWS STORM PREDICTION CENTER NORMAN OK 1225 PM EDT TUE JUN 5 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF FAR SOUTHEAST ALABAMA NORTHERN FLORIDA CENTRAL AND SOUTHERN GEORGIA FAR SOUTHERN SOUTH CAROLINA COASTAL WATERS EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL 900 PM EDT. HAIL TO 2 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 75 STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES EAST OF BRUNSWICK GEORGIA TO 45 MILES NORTH OF MARIANNA FLORIDA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). 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...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON ALONG AND AHEAD OF COLD FRONT SETTLING SWD THROUGH THE REGION. MODIFICATION OF 12Z OBSERVED SOUNDINGS WITH CURRENT SURFACE CONDITIONS SUGGESTS THAT AIR MASS IS ALREADY MODERATELY UNSTABLE /I.E. MLCAPE OF 1000-2000 J PER KG/ WITH LITTLE OR NO CONVECTIVE INHIBITION. WHEN COUPLED WITH 30-40 KT OF DEEP WNWLY SHEAR...SETUP WILL FAVOR THE DEVELOPMENT OF SUPERCELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND LARGE HAIL. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 29035.
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