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URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 426

NWS Storm Prediction Center Norman OK

1125 AM CDT Mon Aug 10 2020



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Eastern Iowa

  Northern Illinois

  Far northwest Indiana

  Far southern Wisconsin

  Lake Michigan



* Effective this Monday morning and evening from 1125 AM until

  700 PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



* Primary threats include...

  Widespread damaging winds and scattered significant gusts to 100

    mph likely

  Isolated large hail events to 1.5 inches in diameter possible

  A couple tornadoes possible



SUMMARY...A derecho will rapidly progress across eastern Iowa and

northern Illinois this afternoon. Widespread severe wind gusts, some

of which should reach 80-100 mph are anticipated along the track of

the bow. Brief tornadoes are also possible.



The severe thunderstorm watch area is approximately along and 85

statute miles north and south of a line from 20 miles west southwest

of Cedar Rapids IA to 75 miles south southeast of Racine WI. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU6).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 425...



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

1.5 inches. Extreme turbulence and surface wind gusts to 85 knots. A

few cumulonimbi with maximum tops to 600. Mean storm motion vector

27055.



...Grams

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