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WWUS20 KWNS 142354

SEL4

SPC WW 142354

OKZ000-TXZ000-150700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 414

NWS STORM PREDICTION CENTER NORMAN OK

650 PM CDT SUN JUN 14 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       WESTERN NORTH TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 650 PM UNTIL

200 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

CLINTON OKLAHOMA TO 45 MILES WEST SOUTHWEST OF WICHITA FALLS

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 407...WW 408...WW

409...WW 410...WW 411...WW 412...WW 413...



DISCUSSION...CLUSTERS OF SUSTAINED STORMS/SUPERCELLS EXPECTED TO

MOVE/DEVELOP ENE INTO WRN N TX AND SW OK LATER THIS EVE.

DEVELOPMENT MAY IN PART OCCUR BY DOWNWARD SATURATION FROM THE MID

LVLS...SIMILAR TO WHAT OCCURRED LAST EVE OVER THE RED RVR VLY

REGION.  SOMEWHAT GREATER WLY COMPONENT TO MID LVL FLOW ALSO MAY

ENHANCE EWD MOTION OF STORMS LATER TONIGHT.  THERMODYNAMIC

ENVIRONMENT APPEARS MOST FAVORABLE FOR DMGG WIND...WITH SOME SVR

HAIL.  ANY TORNADO THREAT WILL BE PREDICATED ON STORMS REMAINING

SFC-BASED AS THEY TRACK EWD.  GIVEN EXPECTED DEGREE OF LOW LVL

CIN...AND EXPECTED STRENGTHENING OF SAME AFTER SUNSET...TORNADO

POTENTIAL APPEARS LOW ATTM.  BUT TRENDS OF ERN-MOST STORMS WILL BE

MONITORED FOR MAINTENANCE OF SFC-BASED FEED ...AND ANY POSSIBLE

ENHANCED THREAT FOR TORNADOES.



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 26025.





...CORFIDI

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