Avalanche — Southwest Big Horn Basin, Wyoming

2021-02-11 to 2021-02-12 · Southwest Big Horn Basin, Wyoming

Event narrative

Very cold temperatures hit portions of Natrona County, Wyoming. The Hot Springs County Airport dropped to 21 below zero.

Wider weather episode

An arctic boundary slowly sagged southward across much of northern and central Wyoming and brought bitterly cold temperatures. Temperatures in northern Wyoming fell as low as minus 30. In addition, a couple of moisture laden troughs moved across the area and brought another round of heavy snow to western Wyoming. Some parts of Yellowstone Park had as much as 30 inches of snow. Other locations in Teton, Lincoln and Sublette County also received over a foot of new snow.

Source: NOAA Storm Events Database, event_id 940617. Narrative written by the NWS forecast office that issued the report.