SEL0 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 330 NWS STORM PREDICTION CENTER NORMAN OK 255 PM CDT THU MAY 31 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHEAST LOUISIANA SOUTHEAST AND EAST CENTRAL MISSISSIPPI COASTAL WATERS EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL 900 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 55 STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTHEAST OF NEW ORLEANS LOUISIANA TO 35 MILES WEST NORTHWEST OF MERIDIAN MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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 327...WW 328...WW 329... DISCUSSION...SEVERAL ORGANIZED BANDS OF STRONG/SEVERE STORMS ARE PROGRESSING EWD ACROSS SOUTH CENTRAL MS AND SRN LA. THESE STORMS WILL MOVE INTO A MODERATELY UNSTABLE DOWNSTREAM ENVIRONMENT WITH MLCAPE OF 1500-2000 J/KG. DEEP LAYER SHEAR IN THE LOWEST 8 KM IS SUFFICIENT TO MAINTAIN MULTICELL STRUCTURES WITH STRONGER CELLS CAPABLE OF PRODUCING LOCALIZED DAMAGING WIND GUSTS AND OCCASIONAL HAIL. 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 24020.
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