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Possible existence of a buried snow slab. Internal cohesion of visible and buried snow layers. Recent weather as affecting the last three factors. Evidence of prior avalanches. Depth of snow. Precautions in Avalanche Territory Safest part of slope.—Careful study of dangerous slopes should always be made, if possible, in conjunction with others. The party should give thought to the time of day and its probable effect upon the chances of an avalanche. It will always be preferable to avoid any slopes which appear to be in danger of avalanche. This is not always possible, however, and some consideration must be given to the least dangerous method of traversing dangerous slopes. In general, a dangerous slope should be crossed as near the top as possible. An exception to this rule, however, must be made when the slope is considerably concave, so that the upper portion is steepest. An exception should also be made when the slope is surmounted by a cornice, since there is the double danger that the cornice may fall, thus starting an avalanche, and that a deeply drifted snow cushion may exist just below the cornice. |
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