Tuesday, April 21, 2026

Heavy Snow Winter Advisory Issued for 16 Counties in Idaho and Wyoming


A late-season winter system is ready to convey important snowfall and gusty winds throughout components of Idaho and Wyoming, prompting the Nationwide Climate Service (NWS) to difficulty a Winter Climate Advisory overlaying 16 counties and mountainous areas.

The advisory warns of accumulating snow, hazardous journey situations, and robust winds via Thursday evening, significantly at greater elevations.

Snowfall and Wind Expectations

Forecasters say the storm will primarily affect areas above 6,500 ft, the place snow accumulations are anticipated to vary from 2 to 14 inches in Idaho and 5 to 12 inches throughout a lot of Wyoming. In greater peaks, particularly within the Teton Vary, localized totals might attain as much as 18 inches.

Wind gusts are additionally anticipated to accentuate, with speeds reaching 40 to 50 mph in lots of areas and as much as 45 mph in uncovered mountain passes, creating blowing snow and lowered visibility.

A meteorologist with the Nationwide Climate Service said, “Journey may very well be very troublesome, particularly throughout greater elevations and mountain passes the place snowfall and wind will mix to create harmful situations.”

Areas Below Advisory

In Idaho, the advisory covers mountainous areas together with the Bear River Vary, Caribou Vary, and the Sawtooth and Misplaced River ranges. Communities corresponding to Solar Valley, Stanley, and Island Park are anticipated to see intervals of regular snowfall.

In the meantime, in Wyoming, the advisory extends throughout main mountain areas together with Yellowstone Nationwide Park, the Teton and Gros Ventre Mountains, and the Salt River Vary. Key journey corridors corresponding to Teton Go and Togwotee Go are prone to be impacted by snow-covered roads and lowered visibility.

Timing and Storm Development

The storm will arrive in phases, starting early Wednesday in components of Idaho and increasing throughout Wyoming by noon. Probably the most intense snowfall is anticipated from Wednesday afternoon via Thursday night, with some areas experiencing extended intervals of regular accumulation.

In Idaho’s greater terrain, snowfall might start as early as midnight Tuesday evening, persevering with into Thursday morning. Wyoming areas, together with Yellowstone and surrounding mountain ranges, will see the heaviest impacts from Wednesday afternoon via late Thursday.

Journey Dangers and Security Steerage

Authorities warn that highway situations could rapidly grow to be slippery and harmful, particularly throughout peak journey hours. Blowing snow mixed with sturdy winds might result in sudden drops in visibility, growing the chance of accidents.

Drivers are urged to decelerate and train warning. Emergency officers suggest carrying winter provides, together with blankets, meals, and water, in case of delays or highway closures.

Plan for slippery highway situations and permit further journey time, significantly via mountain passes,” the NWS advisory emphasizes.

Preparedness Measures

The Nationwide Oceanic and Atmospheric Administration (NOAA), which oversees the NWS, encourages residents and vacationers to observe up to date forecasts and highway situations. Idaho vacationers can verify situations by way of the state’s 511 system, whereas Wyoming drivers can entry updates via transportation providers and park authorities.

With spring underway, this advisory highlights the continued danger of winter climate in greater elevations throughout the northern Rockies, the place situations can shift quickly even late within the season.

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