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WWUS20 KWNS 010426

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SPC WW 010426

ARZ000-OKZ000-010900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 268

NWS STORM PREDICTION CENTER NORMAN OK

1125 PM CDT FRI MAY 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  NORTHWESTERN ARKANSAS

  EASTERN OKLAHOMA



* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1125 PM

  UNTIL 400 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 80

    MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES WEST NORTHWEST OF

HARRISON ARKANSAS TO 35 MILES SOUTHEAST OF MCALESTER OKLAHOMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 262...WW 265...WW

266...WW 267...



DISCUSSION...ENVIRONMENT REMAINS STRONGLY SHEARED AND UNSTABLE

ACROSS MUCH OF THE WATCH AREA...WHICH IS EXPECTED TO MAINTAIN THE

RISK FOR ORGANIZED STORM DEVELOPMENT...INCLUDING SUPERCELLS THROUGH

THE OVERNIGHT HOURS.  ADDITIONAL NEW STORM DEVELOPMENT APPEARS

POSSIBLE ALONG AN OUTFLOW BOUNDARY ACROSS EASTERN OKLAHOMA INTO

NORTHWEST ARKANSAS DURING THE NEXT FEW HOURS...AIDED BY FORCING FOR

UPWARD VERTICAL MOTION ASSOCIATED WITH AN UPPER IMPULSE GRADUALLY

TURNING EAST OF THE SOUTHERN HIGH PLAINS.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 26035.





...KERR

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