Winter Weather — Lower Clark Fork Region, Montana

2025-12-26 · Lower Clark Fork Region, Montana

Event narrative

Snow Squall conditions developed along the Interstate 90 corridor extending from Lookout Pass to St. Regis. Lookout Pass enacted a chains required restriction for towing units at 2117MST. Severe travel impacts with poor visibility and life-threatening driving conditions were subsequently noted near Taft (mile marker 6.4) by 2145MST. A brief period of severe driving conditions along Highway 200, northwest of Thompson Falls, was reported by the Montana Department of Transportation around 0200MST on the 27th.

Wider weather episode

A potent Pacific cold front traversed the Northern Rockies on Friday, December 26, 2025, bringing convective snow showers and gusty winds. Behind this initial front, an Arctic boundary began spilling over the Continental Divide into western Montana on Saturday morning, December 27. The steepening low-level lapse rates and intense frontal forcing created an environment primed for organized, convective snow squalls. These squalls produced localized areas of heavy snow, rapid accumulations, and near-zero visibility, leading to dangerous flash freeze conditions and hazardous travel on regional highways, including Interstate 90.

Source: NOAA Storm Events Database, event_id 1307808. Narrative written by the NWS forecast office that issued the report.