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870 

WWUS20 KWNS 072305

SEL0

SPC WW 072305

ARZ000-KSZ000-MOZ000-OKZ000-080600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 740

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT SUN AUG 7 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR NORTHWEST ARKANSAS

       FAR SOUTHEAST KANSAS

       SOUTHERN MISSOURI

       FAR NORTHEAST OKLAHOMA



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 605 PM UNTIL

100 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST

NORTHWEST OF FORT LEONARD WOOD MISSOURI TO 20 MILES SOUTH

SOUTHEAST OF GROVE 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...CONTINUE...WW 734...WW 736...WW

737...WW 738...WW 739...



DISCUSSION...STRONG TSTMS EXPECTED TO CONTINUE FORMING ALONG WNW-ESE

ORIENTED OUTFLOW BOUNDARY IN SE KS/SW MO...WITH DEVELOPMENT

SUPPORTED BY VERY STEEP LOW LVL LAPSE RATES AND AMPLE LOW LVL

MOISTURE.  FORWARD-PROPAGATING SEGMENTS TOWARD THE SE AND ESE APPEAR

LIKELY GIVEN ENVIRONMENTAL WIND FIELD AND INCREASING BOUNDARY LAYER

MOISTURE WITH EWD EXTENT /REF MCD 1888/.  THESE SEGMENTS MAY YIELD

DMGG WIND AND MARGINALLY SVR HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 30025.





...CORFIDI

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