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WWUS20 KWNS 080118

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 258

NWS STORM PREDICTION CENTER NORMAN OK

815 PM CDT SAT JUN 7 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN OKLAHOMA

  NORTHWEST AND NORTH TEXAS



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 815 PM

  UNTIL 400 AM CDT.



* PRIMARY THREATS INCLUDE...

  WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL

    EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST

SOUTHWEST OF ALTUS OKLAHOMA TO 30 MILES EAST NORTHEAST OF DURANT

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 252...WW 253...WW

254...WW 255...WW 256...WW 257...



DISCUSSION...SCTD TSTMS EXPECTED TO INCREASE IN COVERAGE AND

POSSIBLY STRENGTH ALONG AND N OF SLOWLY-MOVING W-E OUTFLOW BOUNDARY

NEAR THE RED RVR. COMBINATION OF APPRECIABLE CAPE...RICH

MOISTURE...AND 25-30 KT WNWLY CLOUD-LAYER SHEAR MAY SUPPORT A FEW

SUSTAINED STORMS/MODEST SUPERCELLS CAPABLE OF VERY LARGE

HAIL...LOCALLY DMGG WIND...AND POSSIBLY A SHORT-LIVED TORNADO.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 29020.





...CORFIDI

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