Winter Storm — Northeast Bighorn Mountains, Wyoming

2020-10-17 to 2020-10-19 · Northeast Bighorn Mountains, Wyoming

Event narrative

Snowfall of 10 to 16 inches occurred in the mountains.

Wider weather episode

An early season arctic airmass arrived into the Billings Forecast Area during the 3rd week of the month. At the same time, a very strong upper level disturbance within an unstable northwest flow aloft was situated over south central Montana and northern Wyoming. The combination of these factors brought heavy, wet snow to a large portion of the forecast area.

Source: NOAA Storm Events Database, event_id 920673. Narrative written by the NWS forecast office that issued the report.