Tornado Watch To The Southwest

SEL9

URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 9
NWS STORM PREDICTION CENTER NORMAN OK
840 AM CST TUE FEB 1 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

MUCH OF LOUISIANA
WEST CENTRAL AND SOUTHWEST MISSISSIPPI
COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 840 AM UNTIL
300 PM CST.

TORNADOES…HAIL TO 1 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 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH OF NATCHEZ
MISSISSIPPI TO 45 MILES SOUTH OF INTRACOASTAL CITY LOUISIANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 STRONGLY FORCED SQUALL LINE MOVE QUICKLY EWD IN
CONJUNCTION WITH A SURFACE COLD FRONT PROGRESSING EWD FROM TX INTO
LA…AND STRONG MIDLEVEL TROUGH EJECTING ENEWD OVER TX/OK. GRADUAL
SURFACE MOISTENING/DESTABILIZATION WILL SUPPORT CONVECTION BASED
NEAR THE SURFACE AS DEWPOINTS INCREASE INTO THE 60S…WHILE VERTICAL
SHEAR WILL BE VERY STRONG AND SUPPORTIVE OF EMBEDDED BOW/SUPERCELL
STRUCTURES IN THE LINE. A FEW TORNADOES AND DAMAGING WINDS WILL BE
THE MAIN THREATS INTO THE AFTERNOON.

AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24045.

…THOMPSON

Category: Severe Weather