Limited light snow is possible over west and central Upper Michigan Monday. A steady south wind with gusts perhaps reaching 25 MPH may create some minor visibility restrictions over the Copper Country and Keweenaw Peninsula through Monday evening. New snow accumulation will be kept to around an inch over west and central Upper Michigan through Monday evening.
A band of heavier snowfall is possible over west/central Upper Michigan through the wee hours on Tuesday morning as deeper moisture arrives. That initial wave will likely keep wet snow in the forecast into early afternoon Tuesday. We expect new snow accumulation over west /central Upper Michigan to amount to roughly three to five inches through Tuesday and Tuesday evening. Snow will be limited to two to three inches towards the eastern Upper Peninsula.
The main center of low pressure will spread eastward into the western Great Lakes Tuesday into Wednesday with more snow and mixed precipitation. There is still some uncertainty as to the timing and precipitation type Tuesday night/Wednesday. However it does appear that the system will strengthen as it spreads into the forecast area. The system has the look of a potentially high-impact late-winter storm with wet, heavy snow, gusty winds and reduced visibility through Wednesday.
As it looks now, enough warm air will be hanging out over southern and eastern Upper Michigan for snow to change to sleet and freezing rain late Tuesday night and Wednesday morning. Currently, there are no winter weather advisories/warnings effective for south and eastern Upper Michigan. However, that may change over the next twenty four hours as the wintry mix could impact your travel plans.
A Winter Storm Watch will be effective for Gogebic, Ontonagon, northern Houghton and Keweenaw Counties from Tuesday morning through Wednesday evening. Temperatures appear cool enough for precipitation to remain as all snow over roughly the western half of Upper Michigan. Total snow accumulation will approach a foot over a large portion of the Copper Country and the higher terrain of west and central Upper Michigan.
Unseasonably cold air and northwest winds will keep lake effect/lake enhanced snow going near the Lake Superior shoreline through the first few days of spring.