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

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...

A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

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

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...

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

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

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