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

Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...

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

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 condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

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