Extreme Cold/Wind Chill in Toole, Montana

Extreme Cold/Wind Chill December 31, 2021 · Toole, Montana

What the National Weather Service wrote

Sweetgrass mesonet site reports a wind chill of -41.

The wider storm

A cold upper level low centered over Canada and its associated upper level trough extending into the Northwestern US brought multiple embedded shortwave disturbances into the Northern Rockies. Meanwhile, at the surface, a cold high pressure system from Western Canada moved southward, eventually settling over the plains of North-Central Montana. This combination of upper level disturbances and very cold air at the surface combined to bring snow and dangerously cold wind chills to the area.

Source: NOAA Storm Events Database, event 999248. Narratives are written by the National Weather Service forecast office that issued the report.

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