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145 

WWUS20 KWNS 211804

SEL6

SPC WW 211804

ALZ000-ARZ000-KYZ000-MOZ000-MSZ000-TNZ000-212300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 6

NWS STORM PREDICTION CENTER NORMAN OK

1200 PM CST THU JAN 21 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWESTERN ALABAMA

       NORTHEASTERN ARKANSAS

       SOUTHWESTERN KENTUCKY

       SOUTHEASTERN MISSOURI INCLUDING THE BOOTHEEL

       NORTHEASTERN MISSISSIPPI

       WESTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON FROM NOON UNTIL 500 PM 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF DYERSBURG

TENNESSEE TO 35 MILES SOUTHWEST OF MUSCLE SHOALS ALABAMA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 5...



DISCUSSION...COMPLEX SETUP TODAY AHEAD OF COMPACT...INTENSE LOW

CENTER STACKED OVER NERN AR/SERN MO EARLY THIS AFTERNOON.  AIR MASS

WILL ONLY BECOME MARGINALLY UNSTABLE...HOWEVER -22C H5 COLD POCKET

SHOULD STEEPEN LAPSE RATES AS SURFACE HEATING BEGINS TO ERODE CAP.

LOW-TOPPED THUNDERSTORMS...INCLUDING SUPERCELLS...ARE EXPECTED TO

EVOLVE OVER THE NEXT HOUR OR SO NEAR THE LOW CENTER TRACKING ACROSS

THE BOOTHEEL REGION...AND FARTHER EAST ALONG WIND SHIFT INTO NERN

MS/NWRN AL.  SHEAR REMAINS QUITE STRONG...ESPECIALLY NEAR THE

SURFACE LOW AND INVOF WARM FRONT LIFTING INTO FAR SWRN KY.  LARGE

HAIL WILL BE LIKELY WITH ANY STRONGER CORE GIVEN THE STEEP MID LEVEL

LAPSE RATES AND COLD AIR ALOFT.  ISOLATED TORNADOES WILL BE

ADDITIONAL CONCERN AS SUPERCELLS INTENSIFY THROUGH THE DAY.



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

350. MEAN STORM MOTION VECTOR 25035.





...EVANS

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