ILLINOIS — A tornado watch has been issued for the Chicago area as severe weather is possible Tuesday afternoon and evening. The National Weather Service has issued the watch until 8 p.m. Tuesday for Boone, Cook, Fulton, Jo Daviess, Knox, Lee, McHenry, Putnam, Stephenson, Winnebago, Bureau, De Kalb, Grundy, Kane, Lake, Livingston, Ogle, Rock Island, Whitesite, Carroll, DuPage, Henry, Kendall, La Salle, Marshall, Peoria, Stark and Will counties.

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A fast-moving line of thunderstorms will move into the Chicago area late Tuesday afternoon into the evening. According to the National Weather Service, the main area of concern for a higher tornado threat is west of a Streator to Aurora to Woodstock line.
The storms could produce isolated hail up to quarter-sized, scattered wind gusts up to 75 mph and a few tornadoes, the weather service said. Most of the Chicago area will see the storms between 6 p.m. and 8 p.m.
After a full week of temperatures in the 70s, Tuesday’s high is expected to be around 75 degrees in the Chicago area, while the low is around 31 — a nearly 45-degree temperature shift.
The weather service said the severe weather threat will last up to one to two hours in any location, as the storms are fast-moving. After the storms leave the area Tuesday evening, more-seasonable, cooler temperatures are forecast for the rest of the week.
[h/t] Patch.com