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Lenticular clouds: Those odd, lense-shaped clouds

FILE - Clouds which appear to have been brush-stroked stretch across the Palm Desert sky.
FILE - Clouds which appear to have been brush-stroked stretch across the Palm Desert sky.
The Desert Sun File Photo
The beginnings of a lenticular cloud (center, lens-shaped) is forming over Palm Springs May 28, 2011 about 7:30pm.
The beginnings of a lenticular cloud (center, lens-shaped) is forming over Palm Springs May 28, 2011 about 7:30pm.
The Desert Sun File Photo
A cloud similar cloud is seen over Gene Autry Trail south of Vista Chino in Palm Springs after sunset April 27, 2010. Lenticular clouds are formed as moist air flows over a mountain. Waves of air may form on the downward side of the mountain, which is Mount San Jacinto, as the air moves down into the trough. Bright colors called Irisation are sometimes seen along the edge of lenticular clouds.
A cloud similar cloud is seen over Gene Autry Trail south of Vista Chino in Palm Springs after sunset April 27, 2010. Lenticular clouds are formed as moist air flows over a mountain. Waves of air may form on the downward side of the mountain, which is Mount San Jacinto, as the air moves down into the trough. Bright colors called Irisation are sometimes seen along the edge of lenticular clouds.
The Desert Sun File Photo
Unusual cloud formations hover over the mountains near Cathedral City Tuesday, April 27, 2010.
Unusual cloud formations hover over the mountains near Cathedral City Tuesday, April 27, 2010.
The Desert Sun File Photo
An odd cloud formation in the desret.
An odd cloud formation in the desret.
The Desert Sun File Photo
Odd cloud formations form over the mountains near Desert Hot Springs.
Odd cloud formations form over the mountains near Desert Hot Springs.
The Desert Sun File Photo
Unusual cloud formations hover over the mountains near Cathedral City Tuesday, April 27, 2010.
Unusual cloud formations hover over the mountains near Cathedral City Tuesday, April 27, 2010.
The Desert Sun File Photo
Unusual cloud formations hover over Rancho Mirage Tuesday, April 27, 2010.
Unusual cloud formations hover over Rancho Mirage Tuesday, April 27, 2010.
Desert Sun File Photo
This photo taken on December 2, 2015 shows a lenticular cloud forming as white streaks from airplanes mark the blue sky, in a rare atmospheric phenomena above the town of Gevgelija on December 2, 2015.
This photo taken on December 2, 2015 shows a lenticular cloud forming as white streaks from airplanes mark the blue sky, in a rare atmospheric phenomena above the town of Gevgelija on December 2, 2015.
Armend Nimani/AFP/Getty Images
Lenticular clouds are seen in the sky as a cars pass at sunset near the highway Milan-Turin on October 29, 2017 near Novara, northwest Italy.
Lenticular clouds are seen in the sky as a cars pass at sunset near the highway Milan-Turin on October 29, 2017 near Novara, northwest Italy.
Marco Bertorello/AFP/Getty Images