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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 697

NWS STORM PREDICTION CENTER NORMAN OK

530 PM CDT SUN OCT 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWEST OKLAHOMA

       WESTERN NORTH TEXAS



EFFECTIVE THIS SUNDAY AFTERNOON FROM 530 PM UNTIL MIDNIGHT 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES EAST

SOUTHEAST OF OKLAHOMA CITY OKLAHOMA TO 50 MILES SOUTHWEST OF

ALTUS OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...ISOLATED THUNDERSTORMS ARE EXPECTED TO INTENSIFY ALONG

AND SOUTH OF THE SURFACE BOUNDARY OVER WESTERN OK...AND TRACK SLOWLY

EASTWARD ACROSS THE WATCH AREA.  STEEP MID LEVEL LAPSE RATES AND

MLCAPE OF 1000-1500 J/KG WILL COMBINE WITH SUFFICIENT EFFECTIVE

SHEAR FOR ISOLATED SUPERCELLS.  LARGE HAIL APPEARS TO BE THE MAIN

THREAT.



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 450. MEAN STORM

MOTION VECTOR 25025.





...HART

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