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WWUS20 KWNS 150209

SEL6

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ARZ000-MOZ000-OKZ000-TXZ000-150900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 136

NWS STORM PREDICTION CENTER NORMAN OK

910 PM CDT THU APR 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND WESTERN ARKANSAS

       EXTREME SOUTHWEST MISSOURI

       EASTERN OKLAHOMA

       EXTREME NORTH CENTRAL AND NORTHEAST TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 910 PM

UNTIL 400 AM CDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 125 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF HARRISON

ARKANSAS TO 40 MILES WEST SOUTHWEST OF TEXARKANA ARKANSAS.  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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 135. WATCH NUMBER 135 WILL NOT BE IN EFFECT AFTER

910 PM CDT.



DISCUSSION...SUPERCELL CLUSTERS IN E/SE OK WILL CONTINUE EWD INTO AR

DURING THE NEXT SEVERAL HOURS...WITH STORMS MAINTAINED BY AN INFLUX

OF LOW-MID 60S DEWPOINTS AND STEEP LAPSE RATES FROM THE W.

LOW-LEVEL SHEAR WILL CONTINUE TO INCREASE THROUGH THE EARLY

OVERNIGHT HOURS...THUS THE THREAT FOR VERY LARGE HAIL AND AN

ISOLATED STRONG TORNADO OR TWO WILL REMAIN THROUGH ABOUT 04-05Z

ACROSS SE OK AND EXTREME W CENTRAL/SW AR.  OVERNIGHT...CONVECTION

SHOULD GRADUALLY EVOLVE INTO A LARGER CLUSTER/MCS WITH THE POTENTIAL

FOR DAMAGING WINDS/HAIL...THOUGH A COUPLE OF TORNADOES WILL ALSO BE

POSSIBLE WITH GIVEN A CONTINUATION OF THE STRONG LOW-LEVEL SHEAR.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 27030.





...THOMPSON

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