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254 

WWUS20 KWNS 121856

SEL5

SPC WW 121856

LAZ000-MSZ000-CWZ000-130200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 145

NWS STORM PREDICTION CENTER NORMAN OK

155 PM CDT SUN APR 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF SOUTHEAST LOUISIANA

       LARGE PART OF SOUTHERN AND CENTRAL MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900

PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EITHER SIDE OF A LINE FROM 25 MILES SOUTHEAST OF HOUMA

LOUISIANA TO 75 MILES NORTHWEST OF JACKSON MISSISSIPPI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 142...WW 143...WW 144...



DISCUSSION...STRONG SHEAR FAVORABLE FOR SUPPORT OF SUPERCELLS IS IN

PLACE ACROSS THE WATCH.  WITH MOIST AND UNSTABLE AIR SPREADING

RAPIDLY NWD IN ADVANCE  OF DEVELOPING SEVERE THUNDERSTORMS

LA...CONDITIONS EXPECTED TO BE FAVORABLE FOR SUPERCELLS AND

TORNADOES THIS AFTERNOON AS STORMS MOVE E/NE ACROSS CENTRAL MS TO

SERN LA.



AVIATION...TORNADOES AND 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 25040.





...HALES

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