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

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

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

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

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

Local winds that blow from slopes to peaks as a result of the heating of the top slopes without being affected by general...

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

An instrument for measuring atmospheric pressure.

The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....