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WWUS20 KWNS 220236

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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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