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647 

WWUS20 KWNS 150117

SEL8

SPC WW 150117

IAZ000-KSZ000-MOZ000-150700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 478

NWS STORM PREDICTION CENTER NORMAN OK

820 PM CDT WED JUL 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL IOWA

       NORTHEAST KANSAS

       NORTHWEST MISSOURI



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 820 PM

UNTIL 200 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF

WATERLOO IOWA TO 20 MILES WEST SOUTHWEST OF MANHATTAN KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 474...WW 475...WW

476...WW 477...



DISCUSSION...BAND OF STRONG/SEVERE STORMS ALONG THE COLD FRONT WILL

CONTINUE TO SPREAD SEWD ACROSS IA/NW MO/NE KS INTO THE OVERNIGHT

HOURS.  THE WIND/HAIL THREAT WILL BE MAINTAINED BY A CORRIDOR OF

STRONG INSTABILITY...THOUGH SLOWLY WEAKENING VERTICAL

SHEAR/INSTABILITY LATER TONIGHT SHOULD RESULT IN A GRADUAL DECREASE

IN THE THREAT LATE 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 550. MEAN STORM

MOTION VECTOR 29020.





...THOMPSON

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