High winds have downed power lines in Polo in northwest Illinois as a severe thunderstorm passed through the area. In Oregon Illinois a transformer has blown up and is on fire.
The severe thunderstorm that is moving through north central Illinois is heading for the northwest suburbs of Chicago. Large hail and high winds are possible in portions of Boone, DeKalb, Kane, McHenry and Winnebago counties in north central and northeast Illinois until 10:30 pm.
High winds gusting to 60 mph or higher have downed trees and power lines in northwest Illinois at Franklin Grove and Milledgeville. Severe thunderstorm warnings have been issued until 9:45 pm for portions of Winnebago, Ogle, Boone and DeKalb counties in north central Illinois.
One inch hail fell at Mt. Morris and 3/4 inch hail at Forreston both in Ogle County at around 9:30 pm..
Showers and thunderstorms have been occurring in the Chicago area most of the evening accompanied by thunder and lightning and brief downpours. Shortly before 9pm some of the storms are now producing hail. Half-inch diameter hail has been reported in the Batavia area around 8:45 p.m. about the same time that pea-size hail fell in Morton Grove.
Farther west another storm that is increasing has prompted the issuance of a severe thunderstorm warning for Ogle County until 9:30 pm with the potential for dropping hailstones up to one inch in diameter.
In the past hour thunderstorms have developed farther south in the Chicago area along a line paralleling Interstate 88 from about Dixon to Aurora. Other storms are beginning to flare in LaSalle County southwest of Ottawa and in Lake County Indiana south of Merrilville.
An area of showers and thunderstorms is covering far northern Illinois including areas north of Chicago from Dubuque and the Quad Cities northeast to Lake and McHenry counties. The has been considerable weakening of the storms in the last hour.
More storms are expected to develop overnight across the area as warm and humid air pushes north from central Illinois.
Shortly before 6pm radar indicated a fairly strong thunderstorms moving into southern Winnebago and southern Boone counties south of Rockford. The storm does not appear to be severe at this time but it could be producing small hail. A report just in indicated marble-size hail near Byron in Ogle County.