Low temperatures at least 20 degrees F below normal will be recorded from the Montana Divide east through most of North Dakota, northern Wyoming and northwestern South Dakota.
Temperatures in still colder areas of northern Montana into western North Dakota will drop to 30 to perhaps 40 degrees below zero F. Williston, N.D., along with Havre and Glasgow, Mont., may well become this cold.
Havre, for instance, has a good shot at breaking its Feb. 1 record low of 30 degrees below zero F that was set in 1989. Glasgow would have to reach 46 degrees below zero F to tie its standing record low for the date. For Williston, a low of 38 degrees below zero F would tie its standing record low.
Tuesday night, the axis of bitter cold will shift south and east with widespread 20 degrees below zero F likely in the Dakotas to western and northern Minnesota.
Story by AccuWeather.com Senior Meteorologist Jim Andrews