

411 

WWUS20 KWNS 102046

SEL6

SPC WW 102046

ARZ000-OKZ000-110300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 366

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT WED JUN 10 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       EASTERN AND NORTHEAST OKLAHOMA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

1000 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 110

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

NORTHWEST OF GROVE OKLAHOMA TO 60 MILES WEST OF MCALESTER

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...CONTINUE...WW 364...WW 365...



DISCUSSION...A LARGE AREA OF CONVECTION IS SPREADING EWD/NEWD FROM

CENTRAL TOWARD ERN OK...IN ADVANCE OF A MID LEVEL TROUGH EJECTING

NEWD OVER THE TX PANHANDLE TO WRN OK.  LIFT IN ADVANCE OF THIS MID

LEVEL WAVE...AND ON THE LEADING EDGE OF A LARGE

CONVECTIVELY-GENERATED COLD POOL...WILL LIKELY LEAD TO ADDITIONAL

THUNDERSTORM DEVELOPMENT THROUGH THE EVENING.  A GRADUAL INCREASE IN

MID LEVEL FLOW FROM W-E AND MODERATE-STRONG INSTABILITY WILL SUPPORT

A CONTINUED THREAT FOR DAMAGING WINDS AND HAIL WITH THE STRONGER

STORMS.



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 26025.





...THOMPSON

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