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

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

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

The term used for turbulence occurring in the absence of clouds or cloud-like elements in the visible area. It is often observed...

A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

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

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...