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

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

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...

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

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

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

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...