The agency tweeted that an EF-0 tornado with peak winds of 70-80 mph touched down from Naperville to Woodridge on Aug. 18 just before 8 p.m. and traveled three miles. A second EF-0 tornado, with peak winds of 65-70 mph touched down near Downers Grove just after 8 p.m. and traveled about a quarter mile.
The Naperville tornado uprooted several trees, one of which fell on a power line.
The National Weather Service confirmed on Aug. 19 that an EF-1 tornado touched down during the severe weather near Lake Geneva, Wis., as well as two more tornado touchdowns in Livingston County. Only minor damage has been reported.