2015년 2월 18일 수요일

America’s Great Outdoors Tumblr updates

02/18/2015 11:07 AM EST



This rare display of lenticular clouds over Grand Teton National Park in Wyoming last week captivated park visitors. Lenticular (lens-shaped) clouds occur when stable, moist air flows over a mountain, creating a series of large-scale standing waves on the downwind side. Photo by Jackie Skaggs, National Park Service.

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