A persistent weak layer near the base of the snowpack is still a concern at the mid and upper elevations. The likelihood for a person to trigger a large slab avalanche on that layer is decreasing very slowly. However, some steep slopes may still be unstable. Due to the potential consequences of being caught in a large slab avalanche and the uncertainties associated with persistent weak layers, conservative terrain choices are warranted. Avalanches are unlikely at the lower elevations.
At the mid and upper elevations humans could trigger persistent slab avalanches up to 4 feet deep. These slabs are most likely to be triggered on northeast through north to northwest aspects and by larger triggers like snowmachines. Previous tracks on a slope may not be an indication of stability.
A pattern shift will occur on Tuesday. Skies will be partly cloudy in the early morning with increasing clouds as the day progresses. By midnight, the oncoming and anticipated storm will bring snowfall to western Wyoming. Temperatures inversions are expected in the morning with upper elevations starting in the single digits while valleys drop again to near ten below. As clouds move in, the inversion will break down with highs In the upper teens expected at the higher elevations where temperatures are to reach the upper teens. West winds are to increase in the evening after a day of five to fifteen mile per hour averages. The general avalanche hazard will be Moderate above 8000 where the chance continues for human triggered avalanches in steep terrain that is underlain by the deep basal facets. Although the likelihood of triggering such an event continues to slowly decrease, one person could still initiate a large slide, even on a tracked slope. Avalanches below 8000 feet are unlikely.
