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WWUS20 KWNS 260542

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 190

NWS STORM PREDICTION CENTER NORMAN OK

1240 AM CDT THU APR 26 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST ALABAMA

       SOUTHEAST LOUISIANA

       SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING FROM 1240 AM UNTIL 800 AM CDT.



TORNADOES...HAIL TO 1.5 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 70 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST OF HOUMA

LOUISIANA TO 50 MILES NORTHEAST OF MOBILE ALABAMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



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.



DISCUSSION...FAVORABLE SHEAR PROFILES/HODOGRAPHS ALONG WITH A MOIST

MODERATELY UNSTABLE AIR MASS SUPPORT SUPERCELL POTENTIAL WITH

CURRENT THUNDERSTORMS MOVING EWD ACROSS WATCH.  AS LARGE SCALE

TROUGH SHIFTS EWD ACROSS LWR/MID MS RIVER VALLEY...THREAT OF

SUPERCELLS/ISOLATED TORNADOES WILL MOVE EWD INTO SWRN AL.



AVIATION...TORNADOES AND 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 25030.





...HALES

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