

907 

WWUS20 KWNS 201757

SEL3

SPC WW 201757

ALZ000-FLZ000-202200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 743

NWS STORM PREDICTION CENTER NORMAN OK

1150 AM CST THU DEC 20 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH CENTRAL ALABAMA

       WESTERN FLORIDA PANHANDLE



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1150 AM UNTIL

400 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 45 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST SOUTHWEST OF

EVERGREEN ALABAMA TO 25 MILES NORTHEAST OF CRESTVIEW FLORIDA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 741...WW 742...



DISCUSSION...MESOLOW AND ASSOCIATED BOW ECHO IN WRN AL ARE MOVING

EWD AT 50 KT AND SHOULD CONTINUE TO DO SO THROUGH THE AFTERNOON

HOURS. DESPITE VERY WEAK INSTABILITY...MUCAPES BETWEEN 100-300

J/KG...THE FAST MOTION OF THE SYSTEM COMBINED WITH STRONG DOWNWARD

MOMENTUM SHOULD RESULT IN CONTINUED WIND DAMAGE. ISOLATED TORNADOES

ARE ALSO POSSIBLE NEAR THE MESOLOW CIRCULATION.



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 400.

MEAN STORM MOTION VECTOR 27050.





...IMY

