Unstable Snow Conditions
Unstable Snow Conditions : Physical characteristics of the snowpack which may result in avalanching. The presence of TG metamorphism, surface hoar or graupel may indicate an unstable snowpack in old snow. In new snow, instability often results from a heavy strong layer (e.g., wind slab) deposited over a relatively light (low density) or weak layer (e.g., surface hoar, low wind deposited snow). Rising temperatures, winds or snowfall intensity during a storm usually lead to unstable snow conditions
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