National Weather Service United States Department of Commerce


A robust upper trough approached the western Great Lakes on September 25, while low pressure developed over northern Lower Michigan along a cold front draped over the region. Ahead of this cold front, southwest winds brought warm and moist air (dew points exceeding 70 degrees in a few areas) to Southeast Michigan during the daytime and evening hours. This air mass paired with ample wind shear (bulk wind shear of greater than 40 kt and low level helicity exceeding 100 m²/s²) was sufficient for a couple rounds of thunderstorms to move through the area. One round of storms developed over West Michigan in the afternoon and moved northeast into the Tri-Cities area by early evening. No damage was reported from these storms, but almost 2 inches of rain fell around Midland.

Another round of storms formed near the Michigan/Ohio border in the evening and moved through our southeastern counties. These storms strengthened quickly and produced three tornadoes over northern Monroe and southern Wayne Counties in addition to heavy rainfall. Additional information on the tornadoes can be found under the Tornado Summary tab.

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