Cold weather, especially if it is abetted by wind and rain, can bring deadly hypothermia. Hot weather, on the other hand, poses the dangers of dehydration and hyperthermia. (Specialized courses and publications on mountaineering first aid provide information for diagnosis and treatment of these conditions.) Lightning, although not one of the principal hazards of mountaineering, has caused a number of serious accidents. The peaks and ridges that climbers seek generate the vertical updrafts and rain-cloud conditions that generate lightning.
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