Altocumulus (mackerel sky) clouds with dark stratus cloud beneath near sunset
Altocumulus clouds form between 6500 feet (2000 meters) and 20,000 feet (6000 meters). When mid-altitude altocumulus or high-altitude cirrocumulus display an undulating or rippled appearance, the so-called 'mackerel sky,' they often signal a change in weather.
Size: 3467px × 5200px
Location: northern California, USA
Photo credit: © Denise Dethlefsen / Alamy / Afripics
License: Licensed
Model Released: No
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