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WWUS20 KWNS 182054

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 504

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT SAT JUN 18 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTH CENTRAL OKLAHOMA

       PARTS OF NORTH CENTRAL AND NORTHWEST TEXAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

1100 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES NORTH

NORTHEAST OF ARDMORE OKLAHOMA TO 65 MILES WEST SOUTHWEST OF

MINERAL WELLS 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 499...WW 500...WW

501...WW 502...WW 503...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG THE DRY LINE WHICH

EXTENDS NNE/SSW THRU THE WATCH.  HOT VERY UNSTABLE AIR MASS

INCLUDING VERY HIGH DCAPE SUPPORTS DAMAGING DOWNBURSTS  WITH ANY

THUNDERSTORM THAT DEVELOPS.  IN ADDITION LARGE HAIL IS ALSO

POSSIBLE.



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 24015.





...HALES

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