A very potent upper-level low has moved into the intermountain West associated with a trough of low pressure, that will become near-stationary across this region during much of this week. While this low brings heavy snow to much of the West, a couple disturbances spinning around the main upper-level disturbance will fuel the waves of snow that will move through the Northern Plains Sunday through Tuesday evening of this week.
On Sunday, a swath of light to moderate snow will affect eastern Montana and all of North Dakota throughout the morning while that snow extends into northern Minnesota and lasts through much of the day. Snow will also work into extreme-northern Wisconsin and the western Upper Peninsula of Michigan by the evening and will continue through much of the overnight hours. Meanwhile back toward the west, our next round of snow will start to take shape with snow moving into western South Dakota and southwestern North Dakota by the late-afternoon. Then overnight Sunday, the snowfall rates associated with this round will lessen while continuing across mainly South Dakota. A few snow showers may also sneak into northern Nebraska while a wintry mix and freezing rain possibly breaks out in eastern Nebraska into northwestern Iowa.
As we get into Monday, the active wintry weather will continue. More freezing rain will break out to the south in portions of the Midwest, which we’ll touch on in a separate article that we’ll release Monday morning. In terms of the snow, a light snow for the most part is forecast through much of the day across South Dakota and around its northern and southern borders as well as into southern Minnesota into northern Wisconsin while freezing rain falls to the south. Then as we get into the overnight hours of Monday, the snow will persist across similar areas. A band of heavy snow is expected to develop from the Colorado Rockies into the Front Range through western and northern Nebraska into much of South Dakota for a few hours and into much of Minnesota, although the snow will be a bit lighter in that region. Snow showers are also possible in eastern Northern Dakota, northern Wisconsin, and the Upper Peninsula of Michigan. In Denver, it will be around 60 degrees on Sunday, but colder air will intrude from the north, allowing for several inches to fall Monday night.
Most of the activity will dwindle down as we get into Tuesday as the energy associated with this final disturbance–for now–moves into Canada. A few scattered, light snow showers are possible in portions of the Northern and Central Plains while a widespread light snow departs by the midday hours in the Upper Midwest, including most of Minnesota into northern Wisconsin and the Upper Peninsula of Michigan. By Tuesday evening, all of the wintry weather will depart this region, although freezing rain will continue in the Quad Cities region.