At a Glance

Another snowmaker will track across the nation's northern tier this week.This system is not expected to be as strong as Winter Storm Harper, but some travel impacts are possible along its path.Winter storm watches have already been issued.

Another cross-country swath of snow is likely from the Northwest and Rockies to the Midwest and Northeast on the heels of .

The system has already brought snow to the Cascades and Sierra Nevada and will spread into the Rockies and northern Plains through Monday.

Current Radar

Winter storm watches have already been posted in parts of the Rockies, from Wyoming and the Nebraska panhandle to Utah, including the Salt Lake City metro area. Winter storm warnings are posted in the Sierra through Monday morning.

Current Winter Alerts

Cold air is expected to remain in place in the northern tier of states as a low-pressure system tracks from the Pacific Northwest early in the week into the Great Lakes by midweek. Along and north of the low's track, temperatures are expected to be cold enough for snow.

While this is expected to be a lighter snowfall event overall than Winter Storm Harper, it may still produce travel impacts in the affected areas in the form of slippery, snow-covered roads and blowing and drifting snow.

Here is our forecast timeline, followed by our latest snowfall forecast.

Sunday-Monday

Snow will first arrive in the Cascades, Sierra Nevada, Great Basin and northern Rockies Sunday.Portions of the Sierra Nevada will see heavy snow through Sunday night.On Monday, snow will persist from parts of the Great Basin into the northern and central Rockies while also spreading into the northern and central Plains and upper Midwest through the day.Monday night, the swath of snow will stretch from the central Rockies to the central Plains, upper Midwest and northern Great Lakes. Some patchy freezing rain or sleet is possible in the central Plains.

Monday's Forecast

(The green shadings depict where rain is expected. Areas that are shaded blue are expected to see snow. Purple-shaded locations may see either rain or snow. Areas in pink are expected to see sleet or freezing rain (ice).)

Tuesday

Although this storm is not expected to be particularly strong, the low-pressure system may intensify a bit on Tuesday as it moves into the Midwest.A band of moderate to locally heavy snow may set up from parts of Nebraska and Iowa into southeast Minnesota, far northern Illinois, Wisconsin and Lower Michigan.Some freezing rain or sleet ma fall in parts of Iowa and Illinois. This could lead to travel impacts, including snow-covered roads and flight delays.Snow will spread into parts of the interior Northeast Tuesday night, from northern Pennsylvania into western, central and upstate New York. Some freezing rain or sleet is possible.

Tuesday's Forecast

(The green shadings depict where rain is expected. Areas that are shaded blue are expected to see snow. Purple-shaded locations may see either rain or snow. Areas in pink are expected to see sleet or freezing rain (ice).)

Wednesday

The area of low pressure will track into southeastern Canada, but snow and some freezing rain will remain possible across parts of the interior Northeast.Mainly rain is expected along the Interstate 95 corridor from Boston to New York City and Philadelphia.Another wave of low pressure may develop along the cold front by Wednesday night or Thursday.This could allow snow to persist in portions of the interior Northeast Wednesday night through Thursday.

Wednesday's Forecast

(The green shadings depict where rain is expected. Areas that are shaded blue are expected to see snow. Purple-shaded locations may see either rain or snow. Areas in pink are expected to see sleet or freezing rain (ice).)

Snowfall Forecast

Parts of the Rockies and Sierra will pick up a foot of snow.A swath of the upper Midwest from Nebraska to Michigan may pick up 6 inches of snow Tuesday into Wednesday.It remains too soon to be certain, but most areas of the interior Northeast, from northern Pennsylvania to western, central, upstate New York and northern New England are expected to see light to moderate snow accumulations, much less than those from Winter Storm .

Snowfall Forecast

Check back to weather.com for forecast updates on this week's snowmaker, as we'll be able to iron out the key details in the coming days.