Advisory Archive

Over the past 48 hours, 10 inches of snow has fallen in the mountains near West Yellowstone, and 7-8 inches has fallen elsewhere. This new snow combined with snow already on the ground provides more than enough for an avalanche, especially if strong winds have formed wind slabs. The new snow will be found on a variety of surfaces that can range from bare ground to weak faceted snow. Regardless of the underlying surface, avalanches are most common immediately after a storm.