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WWUS20 KWNS 311546

SEL7

SPC WW 311546

LAZ000-MSZ000-TXZ000-CWZ000-312300-



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

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