"Monday afternoon into Tuesday is the main punch, with widespread mountain snow and strong winds as a sharp cold front sweeps the Northern Rockies. Precipitation increases from west to east on Monday, with snow levels running roughly 3,500 to 6,500 feet during the warmest part of the day, so expect wetter snow or a rain mix at lower elevations before colder air arrives."
"Snow quality starts dense to fairly good with snow-to-liquid ratios mostly in the 8-13:1 range early, then improves quickly behind the front as ratios climb into the 14-18:1 range. Winds ramp during the frontal passage, and exposed ridgelines in Montana and western Wyoming can see gusts pushing into the 40 to 60 mph range at times, which may disrupt upper-mountain lifts."
An active week will impact the Northern Rockies with a major Monday night into Tuesday storm followed by colder, higher-quality snow showers through Friday. Snow levels will be high Monday, roughly 3,500–6,500 feet, then crash to valley floors Tuesday as a sharp cold front passes. The central Idaho mountains, Tetons, and Idaho Panhandle will see the most consistent accumulations; interior British Columbia and Alberta will receive steadier, lighter snow. Early snow will be denser with snow-to-liquid ratios around 8–13:1, improving behind the front to 14–18:1 and into 15–20:1 midweek. Strong ridgeline winds may reach 40–60 mph and could disrupt upper-elevation lifts. Confidence is solid through Friday before a warmer, windier weekend and an uncertain late-window storm signal.
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