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

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

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

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

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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

Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...

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

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

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

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