A Winter Weather Advisory is in effect until 5:00 AM MST Tuesday for the Northern Black Hills of South Dakota and the Wyoming Black Hills. A developing system will produce heavy, wet snow across higher elevations of the Black Hills, with total accumulations of 4 to 6 inches expected, with locally higher amounts possible. Accumulations will be elevation-dependent and largely confined to elevations above ~5,500 feet. In addition to snowfall, northwest winds gusting as high as 45 mph may lead to patchy blowing snow and localized reductions in visibility.

An incoming weather system will bring accumulating wet snow to the higher elevations of the northern Black Hills. Snowfall will be heavily elevation-dependent, with the bulk of accumulating snow confined to terrain above 5,500 feet. General storm totals of 0.5 to 5 inches are favored across the high country, including around Lead. Lower elevations and foothills will see mainly rain, with minimal to no snow accumulation expected. High uncertainty persists regarding the exact timing of the rain-to-snow changeover. Surface and boundary layer temperatures will hover close to freezing. If dynamic cooling forces a faster transition to all snow, localized accumulations could run considerably higher, with the most extreme high-end model simulations indicating localized amounts exceeding 10 inches. Motorists traversing mountain passes should prepare for slushy, snow-covered roads and variable driving conditions through early Tuesday morning.