UPDATE: Emergency crews are searching homes and other structures in a northern Illinois town to make sure nobody is trapped rubble left by Thursday's deadly tornado.
Authorities say 67-year-old Geraldine M. Schultz was killed and eight people injured after the tornado swept through tiny Fairdale, an unincorporated town of about 150 about 80 miles northwest of Chicago.
The National Weather Service says at least two tornadoes churned through six north-central Illinois counties -- Boone, DeKalb, Lee, McHenry, Ogle and Winnebago.
Three teams were being deployed to assess the damage, the path of the tornadoes and their strength.
The tornado struck Fairdale around 7 p.m., sweeping homes off their foundations and leaving streets impassable with debris and downed power lines.
Officials say at least 17 structures were destroyed and about 50 damaged.
The DeKalb County Sheriff said one person is dead and at least 8 others injured in the village of Fairdale.
The deadly tornado touched down in Ashton, moved through Rochelle, and then northeast to between Kirkland and Cherry Valley. There, it sat stationary, uprooting trees and dropping golf ball-sized hail.
Grubsteakers Restaurant in Rochelle sustained serious damage after a tornado touched down in that area. Authorities on the scene said 14 people were trapped inside the restaurant, but all made it out safely. Ogle County Sheriff Brian VanVickle said several structures were damaged in the Flagg Township area. VanVickle also reported several people were transported to Rochelle Hospital but there were no fatalities.
DeKalb Fire Chief Eric Hicks said DeKalb and Sycamore crews were sent to Fairdale to help free people from destroyed buildings in the area.
A surge of very warm and humid air set off the day's severe weather across the Stateline and Illinois. Heavy rainfall, large hail, damaging winds, and a tornadoes were all in play.
Please stay very alert to the changing weather. Be prepared to take action and head to safety immediately if severe weather strikes. Have multiple ways to get alerts.
You can track the storms' progress throughout the day on www.wrex.com/weather, where you can also sign up for text alerts or download the 13 Weather Authority app for your smart phone.
The 13 Weather Authority will be providing updates throughout the night, so make sure you tune in.