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248 

WWUS20 KWNS 112112

SEL4

SPC WW 112112

LAZ000-MSZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 764

NWS STORM PREDICTION CENTER NORMAN OK

315 PM CST SAT DEC 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHEAST LOUISIANA

       LARGE PART OF CENTRAL AND WESTERN MISSISSIPPI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 315 PM UNTIL

900 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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH OF NATCHEZ

MISSISSIPPI TO 30 MILES EAST NORTHEAST OF GREENWOOD MISSISSIPPI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...THUNDERSTORMS ARE INCREASING IN NUMBER AND INTENSITY

AHEAD OF STRONG COLD FRONT MOVING EWD ACROSS AR INTO NRN LA.  AIR

MASS THOUGH ONLY MARGINALLY UNSTABLE...GIVEN THE STRONG SHEAR

PROFILES AND APPROACH OF VIGOROUS UPPER JET...WILL BE SUFFICIENTLY

UNSTABLE TO SUPPORT LOW TOPPED SUPERCELLS AND A TORNADO THREAT.  IN

ADDITION DAMAGING WINDS WILL BECOME AN INCREASING THREAT AS STORMS

EVOLVE INTO A LINE BY THIS EVENING ALONG THE COLD FRONT AS IT MOVES

SEWD ACROSS THE WATCH.



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

400. MEAN STORM MOTION VECTOR 24035.





...HALES

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