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WWUS20 KWNS 251834

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IAZ000-ILZ000-WIZ000-LMZ000-260300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 388

NWS Storm Prediction Center Norman OK

135 PM CDT Tue Sep 25 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Extreme east central and southeastern Iowa

  Northern Illinois

  Southeastern Wisconsin

  Lake Michigan



* Effective this Tuesday afternoon and evening from 135 PM until

  1000 PM CDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible

  Isolated large hail events to 1 inch in diameter possible

  A tornado or two possible



SUMMARY...Storms in eastern Iowa should continue to increase some in

coverage/intensity through the afternoon, as the storms spread into

Illinois and southern Wisconsin.  Damaging winds will be the main

threat with embedded bowing segments.  A mixed mode of line segments

and more discrete supercells is expected, and a tornado or two may

occur with the strongest embedded circulations.



The severe thunderstorm watch area is approximately along and 75

statute miles north and south of a line from 40 miles north

northwest of Burlington IA to 30 miles south southeast of Racine WI.

For a complete depiction of the watch see the associated watch

outline update (WOUS64 KWNS WOU8).



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.



&&



AVIATION...A few severe thunderstorms with hail surface and aloft to

1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few

cumulonimbi with maximum tops to 450. Mean storm motion vector

25040.



...Thompson

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