Clouds are categorized into three main groups based on their altitude: cirrus, cumulus, and stratus. Cirrus clouds are high-altitude clouds, often appearing as thin, wispy strands. They are ...

High altitude cirrus clouds on a fine day in the Adirondacks ... If they grow vertically, extending into the anvil shape of cumulonimbus clouds, a storm is on the way. Stratus clouds lay like a ...