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WWUS20 KWNS 090017

SEL8

SPC WW 090017

ALZ000-MSZ000-090800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 798

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CST TUE DEC 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL ALABAMA

       EASTERN MISSISSIPPI



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 615 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHWEST OF

BIRMINGHAM ALABAMA TO 40 MILES SOUTH SOUTHEAST OF PINE BELT

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 796...WW 797...



DISCUSSION...TSTMS EXPECTED TO PERSIST AND POSSIBLY STRENGTHEN IN

ERN-MOST SW/NE BAND OF TSTMS IN MS AS THE BAND EDGES SLOWLY EWD

THROUGH EARLY WED.  INCREASING SHEAR/ASCENT ASSOCIATED WITH

POWERFUL...EWD-MOVING OK/AR UPR VORT...AND GRADUALLY INCREASING LOW

LVL MOISTURE INFLOW...SUGGEST POTENTIAL FOR A FEW LONGER-LIVED

DISCRETE OR SEMI-DISCRETE SUPERCELLS.  THESE MAY PRODUCE A STRONG

TORNADO OR TWO...IN ADDITION TO HIGH WIND/MARGINALLY SVR HAIL.



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 24050.





...CORFIDI

