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A thermometer and to a slightly lesser extent a hygrometer can be of considerable value in determining the changes which are likely to be taking place in snow condition. An experienced mountaineer can determine temperature and humidity fairly well, however, by "feel" and by telltale signs. Summary of Avalanche Causes An avalanche occurs whenever the pull of gravity on a snow mass is sufficient to overcome anchorage or internal cohesion. To determine the probability of an avalanche on any suspected slope the skier should consider the following factors: Steepness of slope. Shape of slope. Anchorage to ground surface and bond betweensnow layers. |
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