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064 

WWUS20 KWNS 102055

SEL7

SPC WW 102055

ILZ000-INZ000-LMZ000-110400-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 407

NWS Storm Prediction Center Norman OK

355 PM CDT Mon Jul 10 2017



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Illinois

  Northern and Central Indiana

  Lake Michigan



* Effective this Monday afternoon and evening from 355 PM until

  1100 PM CDT.



* Primary threats include...

  Isolated very large hail events to 2 inches in diameter possible

  Isolated damaging wind gusts to 70 mph possible

  A tornado or two possible



SUMMARY...Scattered strong thunderstorms are expected to develop

across northern Illinois over the next few hours. This activity

should mature and spread southeast into Indiana with an attendant

threat of large hail and damaging winds this evening.



The severe thunderstorm watch area is approximately along and 50

statute miles north and south of a line from 60 miles north

northwest of Peoria IL to 5 miles east northeast of Muncie IN. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU7).



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

2 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

28030.



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