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000 

WWUS20 KWNS 032035

SEL0

SPC WW 032035

LAZ000-MSZ000-040100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 340

NWS STORM PREDICTION CENTER NORMAN OK

335 PM CDT SUN JUN 3 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHWEST MISSISSIPPI



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 335 PM UNTIL 800

PM CDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF MC

COMB MISSISSIPPI TO 35 MILES EAST SOUTHEAST OF INTRACOASTAL CITY

LOUISIANA.  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 337...WW 338...WW 339...



DISCUSSION...LONG-LIVED MCS IN CENTRAL LA APPEARS TO HAVE REACHED

PEAK INTENSITY AS OF EARLY AFTERNOON...WITH A HISTORY OF DAMAGING

WINDS.  THOUGH THE CONVECTIVE SYSTEM IS BECOMING A LITTLE LESS

ORGANIZED WITH TIME...AND THE INSTABILITY WEAKENS GRADUALLY WITH EWD

EXTENT...THE THREAT FOR A FEW DAMAGING GUSTS MAY PERSIST FOR A

COUPLE OF HOURS TO THE E OF WW 337.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 30035.





...THOMPSON

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