CHICAGO — Mostly sunny Friday, cooler lakeside. Winds: S 5-15. High: 89/79.

Full forecast details and more at the WGN Weather Center blog

Partly cloudy tonight with slight thunderstorm chance. Winds: SSE 5-10 G15. Low: 64.

Saturday Forecast: Mostly cloudy, 50% rain and thunderstorms. Winds: NNW 5-10. High: 77/67.