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accumulation zone alpine ski Alta anchorage Arapaho National Forest avalanche accidents avalanche conditions avalanche observer avalanche path avalanche study average density barriers Berthoud Pass Big Cottonwood Canyon blasting CD CD climate and weather climax avalanche colored thread profile cornice crust damp dangerous avalanche occurrence delayed action avalanches developed direct action avalanche dry snow explosives exposure Figure Forest Service fracture granular H CD hangfire high alpine zone highway horizontal resistance important inches per hour intermittent hazard internal cohesion mountains National Ski Patrol occur Old Snow Depth Old Snow Surface P.I. Factor party penetrometer precipitation intensity protective measures protective skiing records release resistance to penetration settlement ski area ski mountaineer skiers slab avalanches slab layer slide slidepath sluffing snow and avalanche snow layer snow ranger snow safety Snow Type snowfall intensity snowpack stabilization Stevens Pass sun action temperature Terrain analysis tetrytol thawing tion wet snow windpacked