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Memorial Day thunderstorms produced widespread large hail and wind damage across northern Illinois and northwest Indiana.  There were five brief EF-0 tornadoes confirmed. See this Public Information Statement for the details. 

In addition to the severe weather, heavy rainfall and flooding were reported in many locations.  With the 1.92" of rain recorded at Chicago O'Hare, this set a daily record for precipitation for May 27th, as well as making it the wettest Memorial Day on record.

Preliminary Overview Map - Updated May 29
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