Chicago, Illinois – Cold air rushing across Lake Michigan could trigger bursts of lake-effect snow across the Chicago metro area during St. Patrick’s Day week, raising the potential for sudden travel disruptions just days before the start of spring.
According to the NOAA Climate Prediction Center’s 8–14 day outlook, the period from March 15 through March 21 favors below-normal temperatures across the Midwest and Great Lakes, along with above-normal precipitation signals across the region. As colder Canadian air pushes south over the relatively warmer waters of Lake Michigan, conditions could align for lake-effect snow bands to develop along the Illinois shoreline.
The setup could impact communities including Chicago, Evanston, Waukegan, Skokie, and areas along the North Shore, where narrow snow bands occasionally form and produce quick bursts of accumulation and reduced visibility.
Drivers along Interstate 90, Interstate 94, Lake Shore Drive, and U.S. Route 41 may encounter rapidly changing conditions if lake-effect bands organize. These snow bands can shift quickly and create localized slick roads even when surrounding areas remain mostly clear.
The timing is notable as daylight saving time begins this weekend, yet winterlike conditions could still reach the Great Lakes region even as the first day of spring approaches later that week.
Forecasters will refine the potential for lake-effect snow as the colder air mass approaches, and additional advisories could be issued if wind direction aligns to focus snow bands along the Chicago shoreline.
