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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 796

NWS STORM PREDICTION CENTER NORMAN OK

125 PM CST TUE DEC 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHEAST ARKANSAS

       PARTS OF NORTHERN AND CENTRAL LOUISIANA

       PARTS OF CENTRAL AND SOUTHERN MISSISSIPPI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

900 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 95 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHEAST OF

ALEXANDRIA LOUISIANA TO 30 MILES NORTHWEST OF GREENWOOD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...APPROACH OF POWERFUL UPPER JET AND S/WV TROUGH

RESULTING IN RAPID RETURN OF LOW LEVEL MOISTURE ACROSS LOWER MS

VALLEY AS CYCLOGENESIS TAKES PLACE TO THE NORTH.  THUNDERSTORMS

EXPECTED TO INCREASE IN NUMBER AND INTENSITY EWD ACROSS WATCH AREA.

WITH STRONG...VEERING DEEP LAYER SHEAR PROFILES AND MLCAPES IN WARM

SECTOR TO 1000 J/KG...SUPERCELLS INCLUDING TORNADO POTENTIAL WILL

RAMP UP REMAINDER OF AFTERNOON THRU THE EVENING.



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 500.

MEAN STORM MOTION VECTOR 23040.





...HALES

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