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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A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

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Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

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

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...