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WWUS20 KWNS 210437

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ALZ000-MSZ000-TNZ000-211100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 2

NWS STORM PREDICTION CENTER NORMAN OK

1035 PM CST FRI JAN 20 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       NORTHERN MISSISSIPPI

       SOUTHWEST AND MIDDLE TENNESSEE



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1035 PM

UNTIL 500 AM 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 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTHWEST OF

GREENWOOD MISSISSIPPI TO 75 MILES NORTHEAST OF HUNTSVILLE

ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 BEGINNING TO DEVELOP ALONG A FRONT

ACROSS TN.  STORM COVERAGE/INTENSITY ARE EXPECTED TO INCREASE AND

STORMS WILL SPREAD EWD/SEWD OVERNIGHT AS A WEAK LOW DEVELOPS ACROSS

TN...AND A MIDLEVEL TROUGH MOVES EWD FROM OK/AR/MO.  THE WARM SECTOR

S OF THE FRONT IS WEAKLY UNSTABLE WITH LOW-LEVEL AND DEEP-LAYER

VERTICAL SHEAR THAT IS FAVORABLE FOR EMBEDDED SUPERCELLS AND BOWING

SEGMENTS.  DAMAGING WINDS WILL BE THE MAIN SEVERE THREAT

OVERNIGHT...BUT A TORNADO OR TWO MAY OCCUR IN THE MOIST/STRONGLY

SHEARED ENVIRONMENT...AND MARGINALLY SEVERE HAIL WILL ALSO BE

POSSIBLE.



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 450.

MEAN STORM MOTION VECTOR 26040.





...THOMPSON

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