This is a photograph of altocumulus clouds.
Click on image for full size
Courtesy of UCAR Digital Image Library
Altocumulus
Altocumulus clouds are part of the Middle Cloud
group. They are grayish-white with one part of the cloud
darker than the other. Altocumulus clouds usually form in groups.
Altocumulus clouds are about as wide as your thumb when you hold up your hand at arm's length to look at the cloud.
If you see altocumulus clouds on a warm sticky morning, then expect
thunderstorms by late afternoon.
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