

797 

WWUS20 KWNS 101449

SEL0

SPC WW 101449

ALZ000-LAZ000-MSZ000-CWZ000-102100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 680

NWS STORM PREDICTION CENTER NORMAN OK

850 AM CST MON DEC 10 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWEST ALABAMA

       SOUTHEAST LOUISIANA

       SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 850 AM UNTIL 300

PM CST.



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 55 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTH SOUTHEAST OF

SLIDELL LOUISIANA TO 30 MILES NORTH NORTHWEST OF SELMA 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.



OTHER WATCH INFORMATION...CONTINUE...WW 679...



DISCUSSION...A BROKEN LINE OF THUNDERSTORMS OVER PARTS OF SOUTHEAST

MS AND SOUTHEAST LA WILL PROGRESS EASTWARD ACROSS THE WATCH AREA

TODAY.  INSTABILITY IS ONLY MARGINAL...BUT LOW AND MID LEVEL

VERTICAL SHEAR ARE QUITE STRONG AND SUPPORTIVE OF OCCASIONAL

ROTATING STORMS.  DAMAGING WINDS AND ISOLATED TORNADOES ARE THE MAIN

THREAT.



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

450. MEAN STORM MOTION VECTOR 25035.





...HART

