A complex of showers and thunderstorms developed over Wisconsin and moved southeast into northern Illinois on Wednesday. This marks the beginning of periodic showers and thunderstorms for the next few days across the Chicago area.

A west/east-oriented frontal boundary will vacillate along and generally south of the Interstate 80 corridor, with hard-to-time periods of showers and thunderstorms likely.

At this juncture, it appears the best chance of heavier rainfall will occur later Friday into Saturday when an inch or more of rain is likely at many locations.

It is pretty far out, but a “cool” front is projected to finally move through the Chicago area this coming Tuesday, setting the stage for rain-free conditions the middle of next week.