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694 

WWUS20 KWNS 171416

SEL3

SPC WW 171416

IAZ000-ILZ000-MOZ000-LMZ000-172200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 113

NWS STORM PREDICTION CENTER NORMAN OK

915 AM CDT WED APR 17 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  SOUTHERN IOWA

  NORTHERN ILLINOIS

  NORTHERN MISSOURI

  LAKE MICHIGAN



* EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 915 AM

  UNTIL 500 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF

LAMONI IOWA TO 50 MILES EAST NORTHEAST OF MARSEILLES ILLINOIS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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.



&&



DISCUSSION...VIGOROUS THUNDERSTORM DEVELOPMENT IS EXPECTED TO

PERSIST ALONG A WARM FRONTAL ZONE EXTENDING ACROSS THE WATCH

AREA...INTO AND THROUGH THE AFTERNOON HOURS.  SEVERE HAIL IS

PROBABLE IN STRONGER CELLS.  THE EVOLUTION OF AN INCREASINGLY

ORGANIZED CLUSTER OF STORMS IS POSSIBLE BY THIS

AFTERNOON...ACCOMPANIED BY AN INCREASING RISK FOR POTENTIALLY

DAMAGING WIND GUSTS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50

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

MOTION VECTOR 26040.





...KERR

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