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000 

WWUS20 KWNS 251629

SEL7

SPC WW 251629

LAZ000-CWZ000-252300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 737

NWS STORM PREDICTION CENTER NORMAN OK

1030 AM CST SUN NOV 25 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL AND SOUTHEAST LOUISIANA

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 1030 AM UNTIL

500 PM CST.



TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST NORTHWEST OF

INTRACOASTAL CITY LOUISIANA TO 40 MILES SOUTHEAST OF NEW ORLEANS

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...A WARM FRONT WILL LIFT SLOWLY NWD ACROSS SRN LA THROUGH

THE AFTERNOON IN ADVANCE OF A MID LEVEL LOW OVER TX...AND A SURFACE

LOW DEVELOPING NEWD TOWARD SW LA.  DESPITE WIDESPREAD CLOUDS AND

LIMITED SURFACE HEATING...BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S

WILL CONTRIBUTE TO SBCAPE VALUES OF 500-1000 J/KG THIS AFTERNOON

ALONG AND S OF THE WARM FRONT.  VERTICAL SHEAR WILL BE MAXIMIZED

ALONG THE BOUNDARY...WHERE SUPERCELLS AND A TORNADO OR TWO WILL BE

POSSIBLE.  OTHERWISE...ISOLATED DAMAGING WINDS CAN BE EXPECTED WITH

THE MOST INTENSE STORMS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24025.





...THOMPSON

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