A low pressure system will track northeast along a cold front draped over southeast Michigan tonight. This low will bring light to briefly moderate snowfall to the Saginaw Valley and northern Thumb tonight into Friday morning. The snow may mix with or change over to freezing rain at times. 1 to 3 inches of snowfall is expected, with the highest totals across the north with a lower chance of freezing rain cutting down on snowfall totals. Further south along the Interstate 69 corridor up to an inch of snowfall is expected with rain and freezing rain cutting into the snowfall totals. Up to 0.2" of ice accumulation is possible over the advisory area. A Winter Weather Advisory has been issued for the Saginaw Valley, Northern Thumb, and I-69 Corridor from 10 pm tonight through noon Friday.
A second, stronger storm will follow on the heels of the first storm and will impact the region from Saturday afternoon through Sunday. This storm will have plenty of moisture to work with, so precipitation should be widespread throughout the region. The temperature contrast will be tight from south to north during this event, so confidence is still low with respect to precipitation type. It appears that the main hazards with this storm will be possible flooding from Detroit southward, and possible freezing rain Saturday night. The precipitation should spread south to north across SE MI Saturday afternoon, with the heaviest precipitation occurring Saturday night. Rain will change to snow Sunday afternoon before ending. Please stay tuned for futher details on this storm.
Below is a map of the expected snowfall through Friday morning:
Warning and Advisory information, event slides, additional details, and preparedness information are available at the following links: