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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 799

NWS STORM PREDICTION CENTER NORMAN OK

835 PM CST TUE DEC 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST LOUISIANA

       CENTRAL AND SOUTHERN MISSISSIPPI



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 835 PM

UNTIL 200 AM 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 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF

GREENWOOD MISSISSIPPI TO 35 MILES WEST SOUTHWEST OF MC COMB

MISSISSIPPI.  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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 796. WATCH NUMBER 796 WILL NOT BE IN EFFECT AFTER

835 PM CST. CONTINUE...WW 797...WW 798...



DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING...AND MAY SLIGHTLY

INCREASE IN COVERAGE...ALONG/AHEAD WEAK CONFLUENCE ZONE EXTENDING

FROM NE LA INTO NW MS.  CONFLUENCE ZONE MARKS WRN EDGE OF AXIS OF

MODERATE SFC-BASED INSTABILITY.  LOW LVL WINDS HAVE VEERED IN THIS

REGION RELATIVE TO POINTS FARTHER E.  BUT COMBINATION VERY LONG

HODOGRAPHS /70 KT 0-3 KM BULK SHEAR/...STEEPER LOW LVL LAPSE

RATES...AND RICH MOISTURE SUGGEST THE POTENTIAL FOR A COUPLE

TORNADOES...IN ADDITION TO DMGG WINDS/MARGINALLY SVR HAIL...AS

REGION IS GLANCED BY LARGE SCALE ASCENT ASSOCIATED WITH OK/AR UPR

VORT.



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

500. MEAN STORM MOTION VECTOR 24055.





...CORFIDI

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