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.

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

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

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

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

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