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;
Blue Ridge Mountain Bull Run and Catoctin mountains, which lie approximately to the east across the Loudoun Valley, and Short Hill Mountain, located to the east, which runs parallel to the Blue Ridge for near its northern terminus. To the west of the mountain is the lower Shenandoah Valley. Blue Ridge Mountain is noticeably lower in elevation than other sections of the Blue Ridge Mountains in Virginia. The southern section of the mountain contains the highest peaks, and the ridge gradually loses elevation as it gets closer to the Potomac. Elevations in the gaps are typically around , while peaks range from to