Storm Map: Snow Over the Western Mountains

Storm Map: Snow Over the Western Mountains

A developing early-season winter weather pattern will bring accumulating snow to portions of the northern and central Rockies over the next 48 hours, from Tuesday, October 13, through Thursday morning, October 15. The greatest snowfall potential will be focused across the higher elevations of Idaho, western Montana, Wyoming, and Colorado, where colder air and periods of precipitation will support accumulating mountain snow.

Idaho and Western Montana

Some of the more significant snowfall is expected across the mountains of Idaho and western Montana. The forecast map highlights areas of strong snowfall potential, with localized totals of 4 to 8 inches possible in the most favored locations. Surrounding areas could receive 1 to 4 inches, especially at higher elevations. Snowfall amounts will vary considerably with elevation and the exact track of the precipitation.

Wyoming and the Central Rockies

Snow will also develop across portions of Wyoming and extend southward into the Colorado Rockies. The higher elevations of Colorado have pockets of stronger snowfall potential, with 4 to 8 inches possible in localized mountain areas. Nearby locations could see lighter accumulations, generally ranging from a trace to several inches. Mountain passes and higher-elevation roads may become slick, particularly during periods of heavier snow.

Utah and the Intermountain West

Parts of Utah and the surrounding Intermountain West could see periods of accumulating snow, primarily across higher terrain. The map indicates a broader area of moderate snowfall potential, with localized pockets of stronger accumulation. Lower elevations will have a better chance of seeing little or no accumulation, depending on temperatures and the elevation of the precipitation.

Travel and Outdoor Impacts

Although this is an early-season storm, accumulating snow can still create difficult travel conditions in the mountains. Drivers crossing higher mountain passes should be prepared for reduced visibility and snow-covered roads in the heavier bands. Temperatures and road conditions will determine how quickly snow accumulates, especially at lower elevations.

The Bottom Line

The next two days will bring the first notable mountain snow event to parts of the northern and central Rockies, particularly Idaho, western Montana, Wyoming, and Colorado. The strongest snowfall signal is concentrated over the higher terrain, where localized accumulations of 4 to 8 inches are possible. Lower elevations should generally see lighter amounts, and the snowfall forecast remains dependent on elevation and the placement of the heaviest precipitation bands.