Live snowpack across the country.

# Arctic Alaska Braces for Significant Snowfall as Lower 48 Sees Modest Activity

Snow enthusiasts looking for meaningful accumulation should turn their attention northward to Alaska's Brooks Range, where a potent system is poised to deliver the most substantial snowfall across the nation over the next 48 hours. While the Lower 48 has recorded modest 2-inch totals at Washington's Sawmill Ridge in the Cascades and Colorado's Vallecito in the San Juans over the past day, the real story is unfolding along Alaska's Dalton Highway corridor, where forecast models indicate 4-6 inches of fresh snow accompanied by challenging visibility conditions.

Imnaviat Creek, situated at 68.6°N in Alaska's remote North Slope region, is expected to receive the heaviest snowfall with 6 inches predicted amid rain-snow mix and areas of fog. Just 35 miles south, Atigun Pass—the highest point on the Dalton Highway at 4,739 feet—should see 4 inches of accumulation with freezing fog creating treacherous conditions for the limited traffic traversing this critical supply route to Prudhoe Bay. The pass, which experiences sub-arctic conditions year-round, will see temperatures hovering near freezing as precipitation transitions between rain and snow. Even Prudhoe Bay itself, typically too cold and dry for significant snowfall during warmer months, is forecast for 2 inches with a rain-snow mix, suggesting a robust weather system is impacting Alaska's entire North Slope region.

The contrast between regions is stark: while Colorado's high country at Vallecito recorded 2 inches with thunderstorms likely continuing—typical of late-season convective activity in the Rockies—and Washington's Sawmill Ridge near Snoqualmie Pass received similar totals before clearing to hazy conditions, neither location has significant additional accumulation forecast. The 170-inch base at Sawmill Ridge versus just 3 inches at Vallecito underscores the seasonal differences between maritime and continental snowpacks. For researchers tracking early-season snowpack development or late-season persistence, Alaska's North Slope presents the most dynamic conditions currently, with measurable bases of just 1-2 inches poised to grow substantially. The combination of Arctic moisture, freezing temperatures, and orographic enhancement along the Brooks Range creates optimal conditions for the nation's most significant snowfall event in the current 48-hour window.