Timeline: What to Expect as Storms Eye Chicago Area

As the atmosphere continues to grow unstable, showers and thunderstorms will be likely in parts of the Chicago area.

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Wednesday will stay mostly cloudy, windy, warm and humid, but a passing shower or isolated storm could pop up at any time during the day. Heading into the evening, showers and storms will grow more numerous, with some threatening to become severe.
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Gerald Herbert/AP
Storms will begin moving in from the west Wednesday afternoon and into Wednesday evening.
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Those storms could have the potential to become severe as they develop.
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Rob Grabowski/Invision/AP
A Severe Thunderstorm Watch was issued just after 4 p.m. for 18 counties in Illinois including DeKalb, LaSalle, Cook, DuPage, Kane, Kankakee, Kendall, Lake, McHenry and Will counties in Illinois. It remains in effect until 11 p.m., according to the National Weather Service.
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A Severe Thunderstorm Warning was issued for northwestern Will and southeastern DuPage counties until 5 p.m.
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By late Wednesday evening and into early Thursday morning, the rain and storms will likely become even more widespread.
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The storms are expected to continue through the overnight hours.
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NBC10
By early Thursday morning, the storms will have likely moved out of much of the Chicago area and into northwest Indiana.
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By later Thursday morning, the rain and storms should trail out of the area completely.
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Nearly all of the Chicago area remains under a slight threat for severe weather Wednesday. Much of northwest Indiana remains under the marginal risk.
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A look at your seven-day forecast.
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