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...

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

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

A very cold high pressure that originates over the Arctic Ocean.

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

An instrument for measuring atmospheric pressure.

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

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

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

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