A lenticular cloud caps the summit of Mount Rainier at sunrise in this view from Bonney Lake, Washington. Lenticular clouds form when moist air is forced up and over mountains or other large obstructions. Higher, cirrostratus turn red in the first light of day. Mount Rainier, the highest peak in Washington state and the tallest volcano in the Cascade Mountain Range, has a summit elevation of 14,411 feet (4,392 meters).
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