Altostratus undulatus clouds could be seen Wednesday from the Florida Mesa southeast of Durango. The wavy look is caused by wind shear, which occurs when layers of air at slightly different elevations move at different speeds or directions, according to the National Weather Service in Grand Junction. (Jerry McBride/Durango Herald)
Altostratus undulatus clouds could be seen Wednesday from the Florida Mesa southeast of Durango. The wavy look is caused by wind shear, which occurs when layers of air at slightly different elevations move at different speeds or directions, according to the National Weather Service in Grand Junction. (Jerry McBride/Durango Herald)cca