By Mary Kay Kleist

CHICAGO (CBS) — Be on the lookout for scattered storms in the forecast now through Friday night.

(Credit: CBS)

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According to CBS 2 meteorologist Mary Kay Kleist, this weekend will feature warm and humid conditions.

(Credit: CBS)

There will be pop-up storm chances Saturday afternoon during the heat of the day.

(Credit: CBS)

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Then by Sunday evening, a more organized storm threat takes shape.

(Credit: CBS)

TONIGHT: Scattered showers and thunderstorms. Low of 69.

SATURDAY: Warm and humid. Stray afternoon storm chance. High 86.

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SUNDAY: Heat builds. Afternoon storms develop, especially late in the day. High 90.

Mary Kay Kleist