Dark blue cloudy sky

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

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

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

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

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

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

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

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...