SEVERE THUNDERSTORM WATCH NUMBER 327

SEL7          URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 327     NWS STORM PREDICTION CENTER NORMAN OK     1040 AM CDT THU MAY 31 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  MUCH OF LOUISIANA            SOUTHWEST AND WEST CENTRAL MISSISSIPPI            EXTREME SOUTHEAST TEXAS            COASTAL WATERS          EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1040 AM UNTIL     600 PM CDT.          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 85     STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST     NORTHEAST OF MONROE LOUISIANA TO 45 MILES SOUTH SOUTHEAST OF LAKE     CHARLES LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE     ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).          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...THUNDERSTORMS ARE ORGANIZING INTO A NEW LINE OVER SERN     TX AS ADDITIONAL STORMS HAVE DEVELOPED AHEAD OF AN INITIAL LEADING     LINE...IN ASSOCIATION WITH THE SRN END OF A SHORT WAVE TROUGH MOVING     TOWARD THE LOWER MS VALLEY.  THE AIR MASS AHEAD OF THE CONVECTION IS     VERY UNSTABLE WITH MLCAPE OF 2000-2500 J/KG...AND FURTHER     DESTABILIZATION IS LIKELY AS DIURNAL HEATING CONTINUES.  MODEST DEEP     LAYER SHEAR WILL SUPPORT ORGANIZED MULTICELL STORMS...WITH STRONGEST     CELLS CAPABLE OF LARGE HAIL GIVEN STEEP MID LEVEL LAPSE RATES ALONG     WITH DAMAGING WIND GUSTS /DCAPE AOA 1000 PER KG/.  STORMS SHOULD     SPREAD/DEVELOP EWD THROUGH THE AFTERNOON WITHIN THE EXPANDING CU     FIELD OVER LA AND SWRN MS.          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 550. MEAN STORM     MOTION VECTOR 25020.               ...WEISS