WATCHES: Tornado Watch Number 737

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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