An incoming storm system will bring rain to the Chicago area late tonight into early Friday morning. Most places can expect around a quarter inch or less of rain before conditions clear around daybreak.
Friday will be mostly sunny to partly cloudy with highs in the lower 60s. Winds will increase during the day, gusting up to 30 mph from the west. Enjoy the warm weather while it lasts.
Saturday's temperatures will drop, reaching upper 40s to near 50 degrees with rain moving in by late morning or midday. Rain showers will continue through the afternoon and evening. As the temperature falls in the evening, rain may change to snow.
"Accumulations will be little to none, but grassy and elevated surfaces may see minor slushy accumulations."
Temperatures will fall sharply on Sunday and Monday with highs in the 30s. Lake effect snow showers are possible on both days, though the exact timing and location remain uncertain.
"Most of the activity will be in Northwest Indiana, but we could see some rain or snow in Northeast Illinois if winds shift northeast."
Warmer air will start returning to the region by Tuesday and Wednesday.
Summary: Chicago faces a shift from rain to possible snow this weekend, followed by colder temperatures and potential lake effect snow before a warm-up early next week.
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