Colors of autumn
FRISCO — The seasonal shift in weather patterns often leads to the formation of wave, or lenticular, clouds over the crest of the Rockies. The pattern is most common in autumn, but also occurs in winter and less frequently spring, when stable, fast-moving air flows over mountains or other barriers oriented perpendicular to the direction from which the upper-level wind is blowing. The formation of the clouds often leads to colorful sunsets and sunrises. While they look like they’re standing still, the clouds are constantly dissipating and reforming, with strong winds flowing through them. The clouds are often associated with strong turbulence, so even though they’re pleasing to photographers. pilots are not always happy to see them.