CHICAGO (CBS) — A severe threat for Monday evening is coming in two waves.

(Credit: CBS)

According to CBS 2 meteorologist Mary Kay Kleist, the first is moving in early afternoon through 4:00 p.m., and the next one right behind it from 4:00 to 8:00 p.m.

(Credit: CBS)

So far, clouds and stable rain have kept the atmosphere controlled. But a vigorous upper-level wave will move through over the next few hours, bringing strong lift and gusty, southerly winds.

(Credit: CBS)

Radar signatures are “sneaky” because they don’t look all that impressive, but brief tornadoes can quickly form without a clear sign on our velocity tracker.

(Credit: CBS)

Any storms that form will be fast-moving, generally to the north at 50 mph.

TONIGHT: Severe threat through Monday night. Low 59.

TUESDAY: Mostly cloudy. Cooler. High 71.

WEDNESDAY: Chance of a storm. High 73.

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