Several supercells developed across the northern third of Illinois the afternoon of April 20, 2004, continuing into the evening across northeast parts of the state.
The tornadoes detailed on this page affected Stark and Marshall Counties, within the coverage area of the Lincoln NWS office. Additional information on storms near Granville can be found at the Quad Cities NWS page, and the Utica and Joliet tornado information is available at the Chicago NWS page (PDF format). There were also 12 tornadoes across central and northern Indiana and is covered by the Indianapolis NWS Page and North Webster NWS Page. The Storm Prediction Center (SPC) has an analysis of the tornadic outbreak across northern IL and IN on April 20.
If you have any photos of the tornadoes or damage you wish to share, please send an E-mail to the Lincoln NWS Webmaster.
Stark and Marshall Counties (click image to enlarge)
NWS personnel surveyed a tornado track which crossed the Stark/Marshall county line near Camp Grove.
This tornado touched down approximately 1.2 miles west-southwest of Camp Grove, just south of the intersection of Highway 17 and Highway 40 in eastern Stark County. The tornado was on the ground for 1.8 miles, lifting approximately 0.8 miles north of Camp Grove at county road 1150N. The tornado was rated as intensity F1, with winds estimated between 75 and 80 mph. It was 50 yards wide.
The tornado broke 5 windows at a house and damaged a barn roof on IL-17 just east of the IL-40 intersection. It also uprooted one tree, and snapped 3 other ones off.
No deaths or injuries were reported from this tornado.
Another tornado touched down shortly after the first one lifted. It started 2.5 miles northeast of Camp Grove, just east of the intersection of Western Ave. and county road 150E. It moved east-northeast across the Saratoga Center area and crossed into Bureau County about 1/2 mile west of Whitefield. The tornado traveled an additional 1.5 miles into extreme southern Bureau County, lifting about a mile northeast of Whitefield.
This tornado was on the ground for a total of 7.5 miles. It was rated F1 with maximum wind speeds estimated at 110 mph, and was about a quarter mile wide at its strongest.
The tornado destroyed a shed and pole barn with farm equipment worth nearly a quarter million dollars at Saratoga Center (county roads 1300N and 250E). Numerous trees and power lines were blown down, and a large grain bin was blown into a field.
The parent storm later produced a strong tornado at Granville, in Putnam County. Information on this area can be obtained from the Quad Cities NWS office.
Weather and Radar Images (click to enlarge):
Pictures (click images to enlarge):