Dramatic November sunset (DI02547) Photo by Carlye Calvin
Nature provides a grand flourish for the last day of November. The bottoms of these mountain wave clouds are lit up by the setting sun in this image taken in Boulder, Colorado. Wave clouds form downwind from an obstacle in the path of a strong air current. In the Boulder area, the obstacle is the Front Range of the Rocky Mountains. Mountain wave clouds can often be seen along the lee side of the range.
copyright University Corporation for Atmospheric Research
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