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

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.

Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

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

The branch of science dealing with the laws of motion of air or other gases.

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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