Chicago Weather: Muggy And Warm

CHICAGO (CBS) -- Fog develops Wednesday night as the low drops to 70.

It will be warm and humid the next three days. With higher dewpoints and calm wind, fog is likely toward morning.

A few pop-up showers or storms are possible Thursday and Friday in the heat of the afternoon.

The high for Thursday is 87, Friday 88.

More organized shower and thunderstorm activity expected Saturday with the passage of a cold front.