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

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

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

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

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...

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

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

A type of cloud consisting mostly of small particles such as ice particles.