Hoarfrost atop Mt. LaConte

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In October 2006 we climbed Mt. LaConte in Great Smoky Mountain National Park. The night before our climb a cloud descended on the mountain and then the temperature dropped rapidly resulting in a hoarfrost. The photo shows the frost. There is no snow in this picture, all hoarfrost. Over the next day and a half about 80% of this sublimated and then the frost was gone.