Avalanche — Wind River Basin, Wyoming

2021-09-10 · Wind River Basin, Wyoming

Event narrative

The Lander Airport recorded a maximum wind gust of 60 mph.

Wider weather episode

An upper-level disturbance moved across Wyoming, leading to the development of showers and thunderstorms. Very dry conditions at the surface within a hot airmass generated large dewpoint depressions. As a result, dry microbursts and strong outflow wind occurred ahead of showers and thunderstorms, primarily across Fremont and Sweetwater counties. Winds gusted as high as 68 mph at Southwest Wyoming Regional Airport near Rock Springs and 60 to 65 mph in the vicinity of Lander and Riverton.

Source: NOAA Storm Events Database, event_id 981176. Narrative written by the NWS forecast office that issued the report.