High Wind — Big Belt, Bridger and Castle Mountains, Montana

2024-12-18 · Big Belt, Bridger and Castle Mountains, Montana

Event narrative

Mesonet sensor Bridger Canoyon (MT DOT) measured multiple gusts of 58 mph or greater, including a peak gust of 72 mph. Additional sensors in this zone to measure gusts of 58 mph or greater include RAWS station TT838 Battle Ridge, Weather Underground site Pass CK BAPH - KMTBELGR75, Weather Underground site Big Belt - KMTWHITE67, and mesonet station MTDPC Deep Creek Us12 Mp 23.5.

Wider weather episode

A robust trough digging southeastward from the Pacific Northwest brought a belt of strong mid and low-level westerly flow across the majority of the region December 18. Given the favorable timing of the strongest flow and cold front, winds were easily able to mix to the surface. A respectable pressure gradient also developed across the area, which helped a few sites reach high sustained winds. In northeastern areas the wind took longer to develop, eventually needing the surface low to pull away from AB toward SK. This propelled a front through the area that brought both strong winds as well as rain that fell onto very cold surfaces, resulting in slick roads.

Source: NOAA Storm Events Database, event_id 1221219. Narrative written by the NWS forecast office that issued the report.