National Weather Service United States Department of Commerce

Overview

Despite a mild early and mid-March (multiple 70+ degree days), a colder airmass and widespread accumulating snowfall impacted southeast Michigan on Friday, March 22nd. The snow began early in the morning and peaked during the morning commute as the leading edge of elevated warm advection and accompanying frontogenesis lifted northward into the Great Lakes. By noon, snowfall reports were coming in between 1 to 4 inches while radar presentation showed a transition to linear snowbands that were oriented roughly west to east with a gradual northward trajectory. By afternoon, a shallow dry slot worked in to the southern counties and brought an end to any lingering snow for areas south of I-94. Meanwhile, the elevated warm frontal bands continued their northward trekk and eventually settled between I-69 and M-46, further intensifying as a more favorable environment developed aloft. The band eventually congealed into one and produced moderate to heavy snow between the I-69 and M-46 corridors for several hours before pivoting back to the south as a cold front, with additional accumulations of 1 to 2 inches Friday night as the snow re-expanded south. Snow tapered off after midnight local time, with snow accumulations north of roughly I-94 ranging between 3 to 6 inches with some locally higher spots in the banded region. 

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