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169 

WWUS20 KWNS 200151

SEL9

SPC WW 200151

ARZ000-KSZ000-MOZ000-OKZ000-200900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 719

NWS STORM PREDICTION CENTER NORMAN OK

850 PM CDT WED AUG 19 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST ARKANSAS

       SOUTHEAST KANSAS

       SOUTHWEST MISSOURI

       NORTHEAST OKLAHOMA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 850 PM

UNTIL 400 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 5 MILES WEST NORTHWEST OF

BARTLESVILLE OKLAHOMA TO 40 MILES NORTH NORTHEAST OF FLIPPIN

ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 714...WW 715...WW

716...WW 717...WW 718...



DISCUSSION...SUPERCELL CLUSTER NOW IN SE KS EXPECTED TO MOVE MAINLY

E/ESE ALONG LOW LVL INSTABILITY GRADIENT/OLD OUTFLOW BOUNDARY INTO

SW MO.  ADDITIONAL DEVELOPMENT MAY OCCUR ON SW FLANK OF SYSTEM AS

MOIST/ STRENGTHENING AND VEERING LLJ IMPINGES UPON IT THROUGH LATER

TONIGHT.  COUPLED WITH MID LVL COLD ADVECTION...SLIGHT STRENGTHENING

OF LARGE SCALE ASCENT/WIND FIELD...AND MOIST LOW LVL

ENVIRONMENT...SETUP MAY SUPPORT EMBEDDED BOWING SEGMENTS WITH HIGH

WIND/LARGE HAIL AND ISOLD TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 28030.





...CORFIDI

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