Patchy fog creates dangerous driving conditions across southeastern Michigan
Wednesday morning, May 7, 2025, began with a weather alert for parts of southeastern Michigan, issued by the National Weather Service at 6:52 a.m. EDT, and valid until 9 a.m. EDT. The advisory affects Midland, Bay, Huron, Saginaw, Tuscola, Sanilac, Shiawassee, Genesee, Lapeer, and St. Clair counties.
According to the bulletin, patchy dense fog is spreading across the region during the morning commute, reducing visibility to near zero in some areas. The service warns of sudden changes in visibility, making driving conditions potentially hazardous for early travelers.
Local impact and timing
The fog is most prevalent during the early hours of the day and is expected to dissipate by mid-morning as the sun rises and surface temperatures climb. The visibility disruptions are not uniform, meaning some locations may experience clear conditions, followed suddenly by dense fog banks, particularly in low-lying areas, near lakes, and in rural zones.
Geographic highlights
The counties under alert stretch from Midland in the northwest to St. Clair on the shores of Lake Huron, encompassing both urban centers and agricultural regions. These zones include portions of I-75, US-23, and M-46, making major highways and connectors vulnerable to fog-related travel delays.
