Extreme Cold/Wind Chill in Bears Paw Mountains and Southern Blaine, Montana

RAWS sensor FBLM8 Fort Belknap RAWS measured criteria cold for a few days in a row, including a minimum wind chill of -54F the morning of the 19th.

A stout closed low over Manitoba swung a shortwave around its western periphery and then southward toward the Northern Rockies Feb 16. The wave stalled over MT, resulting in a strongly cyclonic flow aloft, while the main upper disturbance exited eastward.. This allowed for a long duration snow event that lasted into the 18th.

After this system cleared out, a strong surface high resulted in another period of extreme cold. This episode will also serve as the location for additional extreme cold highlights from June 16 through the morning of the 19th.