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WWUS20 KWNS 230503

SEL7

SPC WW 230503

ALZ000-ARZ000-LAZ000-MSZ000-TNZ000-231200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 7

NWS STORM PREDICTION CENTER NORMAN OK

1100 PM CST SUN JAN 22 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST ALABAMA

       EXTREME SOUTHEAST ARKANSAS

       NORTHEAST LOUISIANA

       CENTRAL AND NORTHERN MISSISSIPPI

       WESTERN AND MIDDLE TENNESSEE



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1100 PM UNTIL

600 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF

CLARKSVILLE TENNESSEE TO 50 MILES SOUTH SOUTHWEST OF JACKSON

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 5. WATCH NUMBER 5 WILL NOT BE IN EFFECT AFTER 1100

PM CST. CONTINUE...WW 6...



DISCUSSION...PRE-FRONTAL SQUALL LINE WILL CONTINUE TO SURGE EWD

OVERNIGHT FROM NW MS/WRN TN TO MIDDLE TN AND NW AL...WHILE

ADDITIONAL STORM DEVELOPMENT WILL BE POSSIBLE ACROSS CENTRAL/NE MS

ALONG THE MOIST AXIS/CONFLUENCE BAND.  A VERY STRONG SHEAR

ENVIRONMENT REMAINS IN PLACE ACROSS THE WATCH AREA...WITH AN

ATTENDANT RISK OF BOTH SUPERCELL AND QLCS TORNADOES WHERE

SURFACE-BASED INSTABILITY EXISTS.  EVENTUALLY...THE NE EXTENT OF THE

TORNADO/WIND DAMAGE THREAT WILL BECOME LIMITED BY THE RESIDUAL

COOL/STABLE AIR MASS THAT HAS BEEN SLOW TO ERODE FROM NE AL/NW GA

INTO ERN TN.



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.





...THOMPSON

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