This is a photograph of altocumulus clouds.
Click on image for full size
Courtesy of UCAR Digital Image Library
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.
You might also be interested in:
The middle cloud group is made up of Altostratus and Altocumulus clouds. Middle clouds are made of ice crystals and water droplets. The base of a middle cloud above the surface can be anywhere from 2...more
Thunderstorms are one of the most exciting and dangerous types of weather. Over 40,000 thunderstorms happen around the world each day. Thunderstorms form when very warm, moist air rises into cold air....more
Altostratus clouds belong to the Middle Cloud group. An altostratus cloud usually covers the whole sky. The cloud looks gray or blue-gray. The sun or moon may shine through an altostratus cloud, but will...more
Stratocumulus clouds belong to the Low Cloud group. These clouds are low, lumpy, and gray. These clouds can look like cells under a microscope - sometimes they line up in rows and other times they spread...more
Weather fronts can cause clouds to form. Fronts happen when two large masses of air collide into each other at the Earth's surface. Warm fronts produce clouds when warm air replaces cold air by sliding...more
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...more
Cirrocumulus clouds belong to the High Cloud group. They are small rounded puffs that usually appear in long rows. Cirrocumulus are usually white, but sometimes appear gray. Cirrocumulus clouds are the...more