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WWUS20 KWNS 120121

SEL0

SPC WW 120121

ILZ000-INZ000-MIZ000-LMZ000-120700-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 430

NWS Storm Prediction Center Norman OK

820 PM CDT Wed Aug 11 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  parts of northern Illinois

  northern Indiana

  parts of southern Lower Michigan

  Lake Michigan



* Effective this Wednesday night and Thursday morning from 820 PM

  until 200 AM CDT.



* Primary threats include...

  Isolated damaging wind gusts to 65 mph possible

  Isolated large hail events to 1.5 inches in diameter possible

  A tornado or two possible



SUMMARY...Thunderstorms are forecast to increase in coverage over

the next couple of hours across the watch area, with the stronger

storms capable of producing wind gusts to severe levels, as well as

hail in excess of 1" in diameter through the evening hours.



The severe thunderstorm watch area is approximately along and 55

statute miles north and south of a line from 50 miles southwest of

Rockford IL to 25 miles southeast of Kalamazoo MI. 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.



&&



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

1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A

few cumulonimbi with maximum tops to 550. Mean storm motion vector

27040.



...Goss

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