

906 

WWUS20 KWNS 132118

SEL2

SPC WW 132118

ALZ000-LAZ000-MSZ000-140100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 152

NWS STORM PREDICTION CENTER NORMAN OK

420 PM CDT MON APR 13 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A SMALL PART OF SOUTHWEST ALABAMA

       SOUTHEAST LOUISIANA

       SOUTHERN INTO EAST CENTRAL MISSISSIPPI



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 420 PM UNTIL 800

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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHEAST OF PINE BELT MISSISSIPPI TO 30 MILES EAST SOUTHEAST OF

BATON ROUGE LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 150...WW 151...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING NEAR A NNE-SSW OUTFLOW

BOUNDARY EMANATING FROM THE LARGE MCS OVER THE NRN GULF OF

MEXICO...AND A WEAK COLD FRONT IS ALSO APPROACHING THIS AREA FROM

THE W IN ASSOCIATION WITH THE MID LEVEL TROUGH JUST W OF THE MS

RIVER.  A CORRIDOR OF MODERATE INSTABILITY AND STRONG VERTICAL SPEED

SHEAR WILL SUPPORT A FEW ORGANIZED STORMS...INCLUDING SUPERCELLS

CAPABLE OF PRODUCING LARGE HAIL/DAMAGING WINDS THROUGH ABOUT SUNSET.



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 500. MEAN STORM

MOTION VECTOR 27030.





...THOMPSON

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