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WWUS20 KWNS 291145

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SPC WW 291145

OKZ000-291700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 780

NWS STORM PREDICTION CENTER NORMAN OK

645 AM CDT THU OCT 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND EASTERN OKLAHOMA



EFFECTIVE THIS THURSDAY MORNING FROM 645 AM UNTIL NOON CDT.



HAIL TO 0.5 INCH 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH

NORTHEAST OF BARTLESVILLE OKLAHOMA TO 10 MILES SOUTH SOUTHEAST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 778...TORNADO WATCH NUMBER 779. WATCH NUMBER

778 779 WILL NOT BE IN EFFECT AFTER 645 AM CDT.



DISCUSSION...QLCS WITH EMBEDDED BOWING STRUCTURES IS EXPECTED TO

CONTINUE EWD ACROSS THE ERN HALF OF OK THIS MORNING.  WHILE VERTICAL

SHEAR REMAINS QUITE STRONG...COMBINATION OF PACIFIC FRONT AND

CONVECTIVE OUTFLOW SHOULD SERVE TO MAINTAIN AN OUTFLOW-DOMINANT...

LINEAR CONVECTIVE MODE WITH DAMAGING WIND GUSTS BEING THE PRIMARY

SEVERE WEATHER THREAT.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 21040.





...MEAD/IMY

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