Weather
A cold, efficient early-week storm brings light to locally moderate, generally high-quality snow to most Northern Rockies resorts, followed by a brief midweek lull and then a return to a more active, somewhat milder pattern that favors additional mountain snow into next week. New snow from Monday night into Wednesday focuses on the higher terrain of northern Idaho, northwest Montana, southwest Montana, and northwest Wyoming, with low snow levels and mostly dry, chalky snow at elevation. Winds are occasionally gusty on the higher ridges, especially around southwest Montana and northwest Wyoming, but ease with time as high pressure noses in midweek. Late in the week and into the 6–14 day window, guidance points toward above-normal temperatures and above-normal precipitation for Idaho, western Montana, and Wyoming, suggesting continued storm chances, higher snow levels at times, and good odds of ongoing base building at the mid and upper elevations, especially for high-base resorts.
The Northern Rockies kick off the week with a cold Monday night through Tuesday system that spreads fresh snow across nearly every mountain in the region. Moisture sliding in on northwest flow overlies modified arctic air in western Montana and north-central Idaho and colder low levels across Wyoming, so snow falls at essentially all elevations rather than splitting into rain at the base and snow up high. Northern Idaho and northwest Montana see the steadiest snow with this wave, favoring Whitefish Mountain, Schweitzer, Big White, and RED Mountain for the most consistent refresh, while lighter but still useful accumulations extend south into Brundage and the West Central Mountains. Farther south and east, the same disturbance brings light to locally moderate snow to Grand Targhee, Jackson Hole, Big Sky, and Bridger Bowl as the trough drops across northwest Wyoming and southwest Montana. Snow levels generally sit around 2,800 to 3,800 feet during the event, and snow-to-liquid ratios mostly in the 13 to 18 to 1 range place the region firmly in the moderate to high snow-quality categories, with the upper-teens values at Grand Targhee, Jackson Hole, Big Sky, and Bridger Bowl supporting pleasantly light, fluffy snow on the upper mountain.
Snow gradually tapers from west to east later Tuesday into Wednesday, leaving lingering light showers in the high country and a cooler, mostly dry midweek interlude. By Tuesday night the main wave is sliding away, with only spotty light snow hanging on into Wednesday around Bridger Bowl and parts of southwest Montana where northwest flow persists a bit longer, consistent with the idea of off-and-on snow through early Wednesday in that corridor. Temperatures at resort elevations hold in the teens and lower 20s, and snow levels settle toward roughly 2,500 to 3,000 feet, so precipitation stays all snow for the mountains with no rain mixing issues. Winds ease compared to Monday night but remain gusty enough on exposed ridgelines near Big Sky and Bridger Bowl, where gusts in the 30 mile per hour range may leave some wind-affected surfaces near the summits while mid-mountain terrain stays softer. For Big Sky, which is already open, this pattern favors a modest refresh of dry snow on a firm early-season base for early-week turns, while the new snow at Grand Targhee, Jackson Hole, Whitefish Mountain, RED Mountain, Schweitzer, Big White, Bridger Bowl, and Brundage mainly helps build coverage ahead of their upcoming early and mid December openings.
Looking further out, the broader pattern keeps the Northern Rockies in a generally active but somewhat milder regime from late week through roughly the middle of the month. Shortwaves sliding in off the Pacific later Thursday into the weekend tap into a renewed feed of moisture, with precipitation chances ramping up Thursday night and especially Friday into Saturday across Idaho and western Montana, then pulsing on and off into early next week as additional waves pass. Snow levels are expected to climb to roughly 5,500 to 7,500 feet late Friday before trending back down toward about 4,500 to 5,500 feet by early next week, so the best prospects for accumulating snow shift toward mid and upper mountain elevations while some of the lowest bases may flirt with mixed precipitation at times. Medium-range outlooks for December 7 through 15 tilt toward above-normal temperatures and above-normal precipitation for Idaho, western Montana, and Wyoming, pointing to continued opportunities for additional base-building storms, with higher-base resorts such as Big Sky, Grand Targhee, and Big White especially well positioned to capitalize, while lower-elevation hills like Schweitzer, Brundage, and RED Mountain may see more variability in snow quality near the base as snow levels rise and fall.
Resort Forecast Totals
- Big White – 5″–7″ Mon night (12/01) – Tue night (12/02)
- Grand Targhee – 4″–6″ Mon night (12/01) – Tue night (12/02)
- Bridger Bowl – 4″–6″ Mon night (12/01) – Wed (12/03)
- Whitefish Mountain – 4″–5″ Mon night (12/01) – Tue night (12/02)
- Big Sky – 4″–5″ Mon night (12/01) – Tue night (12/02)
- Jackson Hole – 2″–3″ Mon night (12/01) – Tue night (12/02)
- RED Mountain – 2″ Mon night (12/01) – Tue (12/02)
- Schweitzer – 2″ Mon night (12/01) – Tue (12/02)
- Brundage – 2″ Mon night (12/01) – Tue night (12/02)
