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 thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.

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

Snow that rises to 8 feet or higher.

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

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