Dark blue cloudy sky

What is Cumulonimbus?

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe weather like hail or tornadoes.

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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 cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

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

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

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

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

An instrument for measuring atmospheric pressure.

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

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