Dark blue cloudy sky

What is Alto?

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus and altocumulus. These clouds are often associated with changing weather patterns.

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Glossary

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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.