A cold air mass has settled into the region with light to moderate winds with a few lingering showers over the higher elevations as a weak weather system passes to the north. The recent storm (1/19 -1/20) deposited 4” to 7” of snow in the Mammoth region and 6” to 8” June Lake and north with little wind leaving a uniform blanket of light transportable snow. Mammoth Mountain winds - Southwesterly – Westerly/20 to 30 mph and are forecasted to continue though the day as a weak disturbance passes to the north of the forecast region with snow showers and a Trace to 1” of new snow, 2” possible in favored areas. Moderate winds will continue build wind slabs until downwind fetches are exhausted. Watch for signs of blowing snow and wind loading (snow banners, recent cornice formation, and fresh drifts). Caution is recommended in steep alpine terrain.
Treeline and below, the persistent weak layer that has plagued us through much of the early part of the season may be showing signs of further weakening in the Mammoth area, renewing concern for potential deep releases, if this trend continues. A new report of whumphing in the Mammoth Lakes Basin highlights this problem layer and the potential for failure. Whumphs (sudden collapse) are a strong sign of instability. Do your own stability assessments, especially as you enter steeper or complex terrain.
Below ~9,000’ the new snow will not be enough to cover the rocks and brush poking up from the surface.