System behaved itself with generally light amounts of snow and sleet reported over northern areas of Southeast Lower Michigan; and a bit of snow with more sleet and freezing rain central and southern areas. Most of the freezing rain was over central areas of the region with ice totals remaining below a 1/4".
Much of the mixed precipitation should fall from the early morning hours into the forenoon hours of Wednesday as it moves in from the south and works its was north. The mixed precipitation will change to light rain, drizzle with just cloudy conditions thereafter in the afternoon. In addition, a moderate east to southeast wind will accompany the event. While there will be strong warmer air riding aloft; indications are the colder air near the surface will begrudgingly give way over portions of Southeast Lower Michigan. At this time, it looks as though central and northern Southeast Lower Michigan...or a line roughly from north of Ann Arbor into Detroit's northern suburbs and areas northward...could see the longest period of mixed precipitation before the changeover. While light amounts of snow, sleet and freezing rain are expected, the sleet and freezing rain will be most problematic with ice amounts less than 1/4" in freezing rain areas. However; this is subject to change if more moisture works in or change-over is delayed.
A sharp temperature-gradient will form over Southeast Lower Michigan on Wednesday with readings rising into at least the 40s behind the surface warm front, while hovering in the lower to mid 30s ahead of it. Look for the warmer air to overtake the entire region during the after as readings rise into the 40s, to around 50 in the south. Then; look for colder air and snow showers to move back into the region Wednesday night.
Motorists be advised driving conditions will deteriorate rapidly as the mixed precipitation encompasses Southeast Lower Michigan during the early morning hours while temperatures are at/or below freezing.
Bill Deedler -SEMI_WeatherHistorian