Mountains + Geology

Image 20 of 102
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AK_0036_Alaska-Lenticular cloud over Chiswell Islands.jpg
A low-lying disc of cloud tops one of the small Chiswell Islands of the coast of the Kenai Peninsula. Lenticular cap clouds form when moist air blows over isolated obstacles. Such small and unusually low clouds require plenty of moisture and just the right amount of wind, so are most often seen on the coasts.