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What is Relative Humidity?

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

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Glossary

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

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

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

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...

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