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WWUS20 KWNS 100841

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 763

NWS STORM PREDICTION CENTER NORMAN OK

345 AM CDT WED AUG 10 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTH CENTRAL KANSAS



EFFECTIVE THIS WEDNESDAY MORNING FROM 345 AM UNTIL 900 AM CDT.



HAIL TO 1.5 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES NORTHWEST

OF MEDICINE LODGE KANSAS TO 70 MILES EAST OF WICHITA KANSAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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

SEVERE THUNDERSTORM WATCH NUMBER 759. WATCH NUMBER 759 WILL NOT

BE IN EFFECT AFTER 345 AM CDT. CONTINUE...WW 760...WW 762...



DISCUSSION...THUNDERSTORM CLUSTERS IN CENTRAL KS MAY PERSIST FOR A

FEW MORE HOURS IN RESPONSE TO LOW-LEVEL WAA AND RESIDUAL

INSTABILITY.  DESPITE SOME STABILIZATION OF THE BOUNDARY

LAYER...MODERATE INSTABILITY AND STRONG VERTICAL SHEAR WILL MAINTAIN

THE CLUSTERS AND AN ASSOCIATED RISK FOR DAMAGING WINDS/HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 30040.





...THOMPSON

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