Snow cornice Snow cornice A snow cornice or simply cornice (from the Italian cornice meaning "ledge") is an overhanging edge of snow on a ridge or the crest of a mountain and along the sides of gullies. They form by wind blowing snow over sharp terrain breaks (e.g. the crest of the mountain) where it attaches and builds out horizontally. This build-up is most common on the steeper and leeward sides of mountains. Cornices are extremely dangerous and travelling above or below them should be avoided. When a cornice "collapses", it breaks in from the cornice to the top of the peak;
Snow Mountain East Snow Mountain East Snow Mountain is a mountain in Northern California in the Snow Mountain Wilderness of Mendocino National Forest. The highest point on the mountain, known as Snow Mountain East, is the highest point in both Colusa and Lake counties. Snow Mountain West, a subsidiary peak also near the county line, is to the southwest at an elevation of . On clear days, the peak should be seen from Mount Diablo, and from several peaks, including Mount Saint Helena and Mount Konocti, in the Mayacamas Mountains. The peaks are visible from Arbuckle on Interstate 5 in California's Central Valley.