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WWUS20 KWNS 102219

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 459

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT FRI JUN 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       WEST TEXAS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 520 PM UNTIL

1100 PM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 115 MILES SOUTH

SOUTHWEST OF CHILDRESS TEXAS TO 30 MILES NORTH NORTHEAST OF ALTUS

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 457...WW 458...



DISCUSSION...A LARGE CLUSTER OF THUNDERSTORMS CONTINUES TO INTENSIFY

OVER WEST TX.  THESE STORMS APPEAR TO BE ORGANIZING A LARGE COLD

POOL...WHICH MAY SURGE NORTHEASTWARD ACROSS THE WATCH AREA IN THE

NEXT FEW HOURS.  STRONG/DAMAGING WINDS ALONG THE LEADING EDGE OF THE

STORMS APPEARS TO BE THE PRIMARY THREAT.  LARGE HAIL WOULD ALSO BE A

RISK IN THE MOST INTENSE CELLS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25030.





...HART

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