

758 

WWUS20 KWNS 280211

SEL4

SPC WW 280211

LAZ000-CWZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 204

NWS STORM PREDICTION CENTER NORMAN OK

910 PM CDT MON APR 27 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST LOUISIANA

       COASTAL WATERS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 910 PM UNTIL

100 AM 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 25 MILES NORTHEAST OF

FORT POLK LOUISIANA TO 55 MILES SOUTHWEST OF INTRACOASTAL CITY

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...SMALL LINEAR MCS WITH EMBEDDED BOW ECHOES AND BRIEF

SUPERCELL STRUCTURES WILL CONTINUE EWD ACROSS SWRN LA THIS EVENING.

LOW LEVEL SHEAR WILL REMAIN SUPPORTIVE OF BRIEF LOW LEVEL

ROTATIONS/POSSIBLE TORNADO...IN ADDITION TO A BROADER THREAT OF

STRONG TO DAMAGING WINDS FOR A FEW MORE HOURS.



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 500. MEAN STORM

MOTION VECTOR 27035.





...EVANS

