WATCHES: Tornado Watch Number 6

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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