Apparently there were a lot of wind gusts well over 60 mph under light stratiform rains over W Michigan between 12:30 and 2:00 AM.
I don’t know for sure, but it seems like a possible wake low (or other mesoscale phenomenon) from weakening storms to the SW mixed strong synoptic winds down to the surface. These were warm winds with temperature up close to 70 degrees a, good 15 degrees above the dewpoint, so definitely not cool outflow.