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WWUS20 KWNS 200639

SEL0

SPC WW 200639

IAZ000-KSZ000-MOZ000-NEZ000-201400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 500

NWS STORM PREDICTION CENTER NORMAN OK

135 AM CDT TUE JUL 20 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWESTERN IOWA

       FAR NORTHEASTERN KANSAS

       NORTHWESTERN AND NORTH CENTRAL MISSOURI

       SOUTHEASTERN NEBRASKA



EFFECTIVE THIS TUESDAY MORNING FROM 135 AM UNTIL 900 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST

NORTHWEST OF BEATRICE NEBRASKA TO 45 MILES EAST NORTHEAST OF

CHILLICOTHE MISSOURI.  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 498...WW 499...



DISCUSSION...A THREAT FOR DAMAGING WINDS AND HAIL WILL SPREAD ESEWD

ACROSS SEVERE THUNDERSTORM WATCH 500 THROUGH THE OVERNIGHT TO EARLY

MORNING TIME PERIOD.  STRONG INSTABILITY AND EFFECTIVE BULK SHEAR

EXCEEDING 50 KT WILL MAINTAIN THE LIKELIHOOD ORGANIZED STORMS TO

AFFECT SERN NEB/FAR NERN KS INTO SWRN IA AND NWRN/NRN MO.



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 600. MEAN STORM

MOTION VECTOR 29035.





...PETERS/THOMPSON

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