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973 

WWUS20 KWNS 061521

SEL9

SPC WW 061521

ARZ000-OKZ000-062300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 239

NWS STORM PREDICTION CENTER NORMAN OK

1020 AM CDT FRI JUN 6 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  ARKANSAS

  EXTREME SOUTHEAST OKLAHOMA



* EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1020 AM UNTIL

  600 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF

FORT SMITH ARKANSAS TO 50 MILES EAST OF LITTLE ROCK ARKANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 238...



DISCUSSION...NEW CELLS ARE DEVELOPING IN ADVANCE OF A LOOSELY

ORGANIZED MCS MOVING ACROSS ERN OK...WITHIN A MODERATE UNSTABLE

ENVIRONMENT CHARACTERIZED BY CAPE OF 2500 J/KG.  EXISTING MCS COLD

POOL AND 50 KT WLY MID LEVEL WINDS EVIDENT ON KTLX VAD PROFILE

INDICATE STORMS WILL SPREAD EWD AS AIR MASS DESTABILIZES FURTHER

INTO THE AFTERNOON IN RESPONSE TO STRONG DIABATIC HEATING.

SUFFICIENT DEEP LAYER SHEAR WILL ENHANCE STORM ORGANIZATION WITH

PRIMARY POTENTIAL FOR DAMAGING WIND GUSTS AND LARGE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 28030.





...WEISS

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