WATCHES: Tornado Watch Number 894

WWUS20 KWNS 220236
SEL4
SPC WW 220236
ARZ000-OKZ000-220800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 894
NWS STORM PREDICTION CENTER NORMAN OK
835 PM CST MON NOV 21 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

SOUTHERN AND PORTIONS OF CENTRAL ARKANSAS
EXTREME SOUTHEAST OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 835 PM UNTIL
200 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 35 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF
DE QUEEN ARKANSAS TO 50 MILES EAST NORTHEAST OF PINE BLUFF
ARKANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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...SFC-BASED/NEAR SFC-BASED STORMS HAVE EVOLVED ON SRN
FRINGE OF OTHERWISE ELEVATED TSTMS ACROSS SERN OK/NERN TX THIS
EVENING. AS LARGE-SCALE ASCENT TIED TO THE MID-LVL WAVE CONTINUES
TO MOVE DOWNSTREAM FROM THE SRN PLAINS...MESOLOW VCNTY SERN OK WILL
TRACK ALONG BAROCLINIC ZONE ACROSS CNTRL AR THROUGH 08Z. AIR MASS
WILL BE CHARACTERIZED BY MLCAPE TO 1000 J/KG AND SUFFICIENT LLVL
SHEAR FOR ISOLD TORNADOES. OTHERWISE...SMALL-SCALE BOWS/LEWPS WILL
LIKELY GIVE DMGG WIND GUSTS...ESPECIALLY ALONG THE TRACK OF THE
MESOLOW.

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 25040.

...RACY

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