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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Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

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Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

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

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

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A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...