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WWUS20 KWNS 231800

SEL1

SPC WW 231800

ARZ000-OKZ000-240100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 431

NWS STORM PREDICTION CENTER NORMAN OK

100 PM CDT WED JUL 23 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND NORTHERN ARKANSAS

  EASTERN OKLAHOMA



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 100 PM

  UNTIL 800 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80

    MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 120

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST

NORTHWEST OF HARRISON ARKANSAS TO 25 MILES WEST SOUTHWEST OF DE

QUEEN ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



&&



DISCUSSION...MULTIPLE CLUSTERS OF STORMS ARE EXPECTED TO

INCREASE/MERGE AND GENERALLY SPREAD SOUTH-SOUTHWESTWARD ACROSS THE

REGION THIS AFTERNOON. THE PRE-STORM AIR MASS HAS BECOME VERY

UNSTABLE WITH MLCAPE AS HIGH AS 3000-5000 J/KG...WITH STORM

ORGANIZATION LIKELY TO BE AIDED BY MODERATE NORTH-NORTHEASTERLY

MID-LEVEL WINDS. DAMAGING WINDS AND BOUTS OF LARGE HAIL WILL BE

POSSIBLE INTO THIS EVENING.



AVIATION...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 550. MEAN STORM

MOTION VECTOR 01045.





...GUYER

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