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647 

WWUS20 KWNS 190454

SEL2

SPC WW 190454

OKZ000-TXZ000-191100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 712

NWS STORM PREDICTION CENTER NORMAN OK

1155 PM CDT TUE AUG 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL OKLAHOMA

       WESTERN NORTH TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1155 PM

UNTIL 600 AM CDT.



HAIL TO 1.5 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 70

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

NORTHWEST OF OKLAHOMA CITY OKLAHOMA TO 10 MILES SOUTH SOUTHWEST

OF WICHITA FALLS TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 710...



DISCUSSION...AN ORGANIZED BOWING SQUALL LINE WILL CONTINUE TO TRACK

EAST-SOUTHEASTWARD ACROSS THE WATCH AREA FOR ANOTHER SEVERAL HOURS.

AMPLE LOW LEVEL MOISTURE AND MODERATE INSTABILITY WILL MAINTAIN

CONVECTIVE INTENSITY...WHILE MESOSCALE ORGANIZATION AND VERTICAL

SHEAR PROFILE SUGGEST THE RISK OF LOCALLY DAMAGING WINDS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 28035.





...HART

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