Dark blue cloudy sky

What is Lightning?

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

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Glossary

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

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

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

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

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.

Snow that rises to 8 feet or higher.

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...