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

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

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

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

Snow that rises to 8 feet or higher.

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.

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