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 weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

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

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

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

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...

Temperature scale, abbreviated as °C, found by accepting the freezing point of water at one atmospheric pressure as zero...

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

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