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WWUS20 KWNS 122018

SEL0

SPC WW 122018

IAZ000-ILZ000-WIZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 70

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT SAT APR 12 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND NORTHEAST IOWA

  EXTREME NORTHWEST ILLINOIS

  SOUTHWEST WISCONSIN



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL

    EVENTS TO 3 INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS

    TO 75 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH

SOUTHWEST OF DENISON IOWA TO 10 MILES SOUTH SOUTHEAST OF MADISON

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON

AND EVENING ALONG A SURFACE BOUNDARY EXTENDING FROM

CENTRAL/NORTHEAST IOWA INTO SOUTHERN WISCONSIN.  STORMS THAT FORM

WILL LIKELY BECOME INTENSE WITH A RISK OF VERY LARGE HAIL AND

DAMAGING WINDS.  ACTIVITY SHOULD SPREAD SOUTHEASTWARD ACROSS THE

WATCH AREA THROUGH THE EVENING.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 25030.





...HART

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