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192 

WWUS20 KWNS 142155

SEL6

SPC WW 142155

IAZ000-KSZ000-NEZ000-150400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 476

NWS STORM PREDICTION CENTER NORMAN OK

455 PM CDT WED JUL 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL AND SOUTHWEST IOWA

       SOUTHWEST INTO NORTH CENTRAL KANSAS

       EAST CENTRAL AND SOUTHEAST NEBRASKA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 455 PM UNTIL

1100 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTH

SOUTHWEST OF GARDEN CITY KANSAS TO 20 MILES NORTH NORTHWEST OF

DENISON IOWA.  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 473...WW 474...WW 475...



DISCUSSION...RAPID THUNDERSTORM DEVELOPMENT IS UNDERWAY ALONG THE

SYNOPTIC WIND SHIFT FROM SW KS NEWD INTO ERN NEB.  MLCAPE NEAR 5500

J/KG AND EFFECTIVE BULK SHEAR OF 30-40 KT WILL SUPPORT A THREAT FOR

SUPERCELLS WITH LARGE HAIL AND DAMAGING WINDS ACROSS ERN NEB/WRN IA.

FARTHER SW INTO KS...MLCAPE OF 3500-4000 J/KG AND WEAKER DEEP-LAYER

SHEAR SUGGEST THAT CLUSTERS WITH DAMAGING DOWNBURSTS AND LARGE HAIL

WILL BE THE MAIN THREATS INTO EARLY TONIGHT.



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 27020.





...THOMPSON

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