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

A middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.