Extreme Cold/Wind Chill — North Big Horn Basin, Wyoming

2017-01-05 to 2017-01-06 · North Big Horn Basin, Wyoming

Event narrative

The temperature dropped to minus 30 degrees at Greybull.

Wider weather episode

A combination of an arctic air mass, a clear sky, a long early January night and a deep, fresh snow pack brought frigid temperatures to much of western and central Wyoming. Four different counties recorded low temperatures under minus 40, including a low of minus 45 East of Rock Springs. All eleven counties in the County Warning Area recorded a temperatures of -30 or lower on the night of January 5-6, 2017.

Source: NOAA Storm Events Database, event_id 669759. Narrative written by the NWS forecast office that issued the report.