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WWUS20 KWNS 080446

SEL6

SPC WW 080446

ARZ000-OKZ000-081200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 366

NWS STORM PREDICTION CENTER NORMAN OK

1145 PM CDT THU JUN 7 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       CENTRAL AND EASTERN OKLAHOMA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1145 PM

UNTIL 700 AM 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 90

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

NORTHWEST OF GROVE OKLAHOMA TO 25 MILES SOUTH SOUTHWEST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 361. WATCH NUMBER 361 WILL NOT BE IN EFFECT

AFTER 1145 PM CDT. CONTINUE...WW 360...WW 362...WW 363...WW

364...WW 365...



DISCUSSION...CLUSTERS OF STRONG TSTMS...SOME OF WHICH MAY BECOME

SUSTAINED/ POSSIBLE SUPERCELLS...EXPECTED TO INCREASE IN COVERAGE

OVER THE NEXT FEW HOURS AS COLD FRONT SWEEPS SE INTO VERY UNSTABLE

AIR.  LOW TO MID LEVEL WIND FIELD SHOULD GRADUALLY WEAKEN OVER

THROUGH SUNRISE... BUT LIKELY WILL REMAIN SUFFICIENT FOR ORGANIZED

ACTIVITY POSING A THREAT FOR LARGE HAIL/HIGH WIND AND PERHAPS AN

ISOLATED TORNADO.  STORMS SHOULD BEC0ME INCREASINGLY UNDERCUT BY

INVADING COOL AIR MASS LATER IN THE PERIOD.



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 26030.





...CORFIDI

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