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

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

A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...

A large body of air having similar horizontal temperature and moisture characteristics.

A cloud of irregular appearance, composed of irregular cloud fragments.

Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

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

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