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At a Glance An arctic cold front has dropped temperatures well below average from the Rockies to the Plains.

This cold weather pattern will persist much of the week while slowly spreading east of the Mississippi River.

Two rounds of snow will also sweep from the Rockies into parts of the Plains and upper Midwest. Arctic cold will engulf much of the western and central U.S. as two rounds of snow develop from the Rockies to the upper Midwest in the week ahead.

A southward plunge of the jet stream will be in place from the Rockies into the central states much of this week, allowing a pipeline of arctic air to remain entrenched over those regions. Two weather systems will tap into that cold air and produce snowfall where they track from the Rockies to the Plains and upper Midwest.

(MORE: Alaska Could Turn Strangely Warm While Much of Nation Shivers)

Early Week Snowmaker

The first snowmaker in this cold weather pattern is spreading snow across parts of Colorado on Monday morning, including the Denver metro area.

Snow will also streak eastward through parts of the Central Plains into the upper Midwest, from northern Kansas and southern Nebraska into the Upper Peninsula of Michigan, Monday into Monday night.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL3_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL3_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL3_1280x720.jpg 800w" > Current Radar

In the upper Midwest, a dusting to a few inches of snow accumulation is expected on Monday night, particularly on grassy areas and elevated surfaces.

This would be the first accumulating snow of the season for many of these areas, including Cedar Rapids, Iowa, and Madison, Wisconsin.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL50_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL50_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL50_1280x720.jpg 800w" > Snowfall Forecast

Cold Outlook

Cold air has already moved into the Rockies and Plains and it will be reinforced by another shot of arctic air by midweek.

On Sunday morning, daily record lows for Oct. 27 were set in Bozeman (8 degrees) and Billings, Montana (14 degrees).

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/acttemp_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/acttemp_1280x720.jpg 400w, https://s.w-x.co/staticmaps/acttemp_1280x720.jpg 800w" > Current Temperatures

Low temperatures much of this week will plunge 10 to 40 degrees below average for late October from portions of the West into the Plains.

(MORE: Current Temperatures | 24-Hour Temperature Change)

Lows in the single digits above and below zero are expected in parts of the Rockies Wednesday and Thursday mornings. Temperatures in the teens may reach as far south as the Texas Panhandle.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL21_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL21_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL21_1280x720.jpg 800w" > Forecast Morning Lows

Some daily record cold temperatures will be broken in the week ahead, especially in parts of the Great Basin and Rockies. Denver's low temperature on Thursday morning could come within a few degrees of the city's all-time coldest October temperature of minus 2 degrees.

Winds will also be gusty at times, making it feel even colder, with dangerous wind chills possible at times.

High temperatures will be 10 to 40 degrees below average may last through midweek.

Temperatures will top out in the 20s in the Rockies and in the 30s in the Northern and Central Plains into the upper Midwest.

A few spots in the higher terrain of the northern and central Rockies may be stuck in the single digits on Tuesday, especially in Wyoming.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL22_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL22_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL22_1280x720.jpg 800w" > Forecast Highs

The cold conditions will slowly push south and eastward as the week progresses.

Colder-than-average temperatures will likely spread east of the Mississippi River late in the week, including parts of the South and Ohio Valley.

The East Coast may wait until next weekend for the below average temperatures to move in.

Second Round of Snow

The next round of snow will begin in Montana on Monday and then will slide southward into Wyoming and Colorado into Tuesday, on a similar path as the early week system.

Denver and Cheyenne, Wyoming, will see several more inches of snow Tuesday into Wednesday.

As this system continues to move eastward, a low pressure system will likely develop mid-to-late week as it tracks through the Midwest.

It is too early for details, but snow may fall on the backside of this system, as cold air moves in. This includes parts of the Plains, Midwest and Great Lakes region into late week. Gusty winds are also possible.

Relatively warm air will remain in place ahead of this system, allowing for widespread rain in the Midwest and East, with thunderstorms in parts of the South.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL31_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL31_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL31_1280x720.jpg 800w" > Thursday'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).)

Be sure to check back to weather.com for updates on this next system.

The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.