WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Autumn shift bringing waves of rain to city

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In marked contrast to the relatively quiescent weather regime that dominated weather across much of North America during September, the October atmosphere has become strongly energized. It's part of the annual cycle of the seasons during which the atmosphere makes a turbulent transition from summer to winter. And now, computer models indicate that we can expect a parade of vigorous storm systems in the next few weeks. The first system brings rain and plenty of it to Chicago and the Midwest from Thursday into Saturday. That's good news for Wisconsin, which has been struggling through several months of far subnormal precipitation that has built into a drought situation across much of the state. This system's rainfall is likely to double Chicago's full September total.
 
And here we go again

A second vigorous storm system heads into the Midwest quickly on the heels of the first. And like the first rainy spell, it too will be attended by abundant moisture and copious rainfall. Preliminary estimates suggest this storm has the potential to deliver one to four inches of rain to the Midwest -- on top of one to four inches from the previous system.