The Spell of the Rockies by Enos A. Mills

The narrow Alpine zone of peaks and snow that forms the crest of the Rocky Mountains has its own individual elemental moods, its characteristic winds, its electrical and other peculiarities, and a climate of its own. Commonly its days are serene and sunny, but from time to time it has hail and snow and showers of wind-blown rain, cold as ice-water. It is subject to violent changes from clear, calm air to blizzard.

I have enjoyed these strange, silent heights in every season of the year. In climbing scores of these peaks, in crossing the passes, often on snowshoes, and in camping here and there on the skyline, I have encountered these climatic changes and had numerous strange experiences. From these experiences I realize that the transcontinental aviator, with this realm of peak and sky, will have some delightful as well as serious surprises. He will encounter stern conditions. He may, like a storm-defying bird, be carried from his course by treacherous currents and battle with breakers or struggle in vain in the monstrous, invisible maelstroms that beset this ocean of air. Of these skyline factors the more imposing are wind, cold, clouds, rain, snow, and subtle, capricious electricity.