Seven tornadoes touched down in north central Illinois in the NWS Chicago County Warning area.
The EF4 tornado that hit Fairdale was rated an EF4 with peak estimated at 200mph.
Three EF0s and 3EF1's were confirmed by the NWS.
The peak tornado season for Chicago is April through June, with April seeing the 2nd highest number of tornadoes behind June.
This was the first EF4 or stronger in Illinois since 2 EF4 tornadoes occurred on November 17th, 2013, including the one that struck the community of Washington.
This was the first EF4 or stronger tornado to hit the NWS Chicago County Warning Area in 25 years, since an F5 tornado struck Plainfield on August 28th, 1990.
- This was the strongest tornado on record (since 1950) for Ogle County, where EF-4 damage was observed. The previous strongest tornado on record in Ogle County since 1950 was an F-3 on August 5, 1979. The last tornado in Ogle County prior to April 9, 2015 was May 22, 2011, when three EF-1 tornadoes occurred.
- This was the strongest tornado on record (since 1950) for DeKalb County, where EF-3 damage was observed. The previous strongest tornado on record in DeKalb County since 1950 was an F-2 on June 18, 1975. The last tornado in DeKalb County prior to April 9, 2015 was an EF-0 on May 13, 2011.