At a Glance

Nancy will spread snow and some ice across the nation's northern tier early this week.The heaviest additional snow is expected from the upper Midwest to the northern Great Lakes.Some freezing rain and sleet is also expected.

Winter Storm Nancy is tracking across the nation's northern tier as the first of two winter storms to bring snow and ice across large portions of the U.S. this week.

Nancy is spreading snow and some ice from the Northern Plains and upper Midwest to northern Great Lakes and northern New England right now.

The storm produced 9.1 inches of snowfall in Billings, Montana, Sunday into Monday. Nearly a foot of snow has been reported near the border between North Dakota and South Dakota.

In Minnesota, more than a half-foot of snow piled up in Duluth on Monday as snow fell at rates of 1 to 2 inches per hour at times. Up to 17 inches has fallen in Nashua, Minnesota.

Nancy's snow and high winds also likely contributed to a .

Winter weather alerts issued by the National Weather Service stretch from parts of the upper Midwest and northern Great Lakes to northern New England. Minneapolis and Fargo, North Dakota, are among the cities covered.

In general, the worst driving conditions are expected in areas where winter storm or blizzard warnings are in effect. Locations in winter weather advisories could also encounter slippery travel at times, either from snow or ice.

(Issued by The Weather Service.)

Following right on the heels of Nancy will be Winter Storm Oaklee, which will take a more southern route across the U.S. later this week. For details on that storm, .

Below is a breakdown of the forecast for Nancy.

Forecast Through Tuesday Night

Heavy snow will persist at times in the upper Midwest and western Great Lakes, and is expected to spread into parts of far northern Maine.

A band of sleet and freezing rain is expected to persist from northeast Iowa to southern and eastern Wisconsin to northern Lower Michigan and will later spread into parts of northern New Hampshire and northern Maine.

Much of the wintry weather from Nancy should taper off across all these areas Tuesday night into early Wednesday morning.

Expect up to 6 inches of additional snowfall on Tuesday from central and northeast Minnesota into northern and central Wisconsin, northern Michigan and far northern Maine.

This includes the Twin Cities, where this longer-lived snowfall could lead to hazardous commutes through Tuesday evening.

Accumulations of freezing rain and/or sleet are also expected along the southern edge of the snowfall map below, generally from parts of northern Iowa into southern Wisconsin, far northern Illinois, northern Lower Michigan and far northern New England.

These ice accumulations are likely to make travel treacherous on Tuesday. Roads, particularly bridges and overpasses will become slippery.

Some power outages due to ice are possible in parts of the Great Lakes, though that depends on how much freezing rain occurs (more ice, more outages) compared to sleet (less ice accumulation, less outages).

Areas in the ice storm warning in northern Michigan have the highest chance of seeing damaging ice.

Snow Forecast

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