Although western North Dakota is recording another mild day, that is not the cast for eastern North Dakota. In the battle between these two air masses, the cold air is going to be winning.
The difference in temperatures is mostly associated with a cold front that is slicing through North Dakota this afternoon but also from the lack of snow cover in the southwestern part of North Dakota.
In the image presented above just off the map is another arctic high pressure center that is moving to the south/southeast. That high is projected to be near the northern part of Lake Winnipeg by noon on Saturday. As it moves southward it will bring with it some significantly colder air to the region and eventually, much of the eastern one-half of the United States.
Because the high will never come directly over North Dakota or Minnesota, the wind will stay up enough to keep the air mixed up a bit keeping the “crazy” cold air out of most of the region, yet, -10s will still be common place with some locations in northeastern ND and northern Minnesota still having -30° low potential. That will also be the area with the lightest wind.
The high coming in will eventually head toward the Great Lakes and an area of low pressure with some snow will move across North Dakota into Minnesota on Saturday Night into Sunday. As the snow moves toward that high pressure, the dry air associated with it will cause the disturbance to weaken, therefore, no huge snowfalls are expected, but some light snow is still possible.
That system on Sunday will bring some warmer temperatures, but quickly behind the snow will come colder air on Monday into Tuesday. This cycle looks to continue for another 10 to 14 days. So generally cold, with intermittent light snow chances with brief warm ups.