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

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

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

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

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...

A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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

Local winds that blow from slopes to peaks as a result of the heating of the top slopes without being affected by general...