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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.





...MEAD

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