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.
댓글 없음:
댓글 쓰기