Dark blue cloudy sky

What is Mesocyclone?

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with a funnel cloud or tornado cloud beneath it and detectable on Doppler radar.

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Glossary

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

The large-scale movement of air that distributes heat and moisture around the Earth, influencing weather patterns and climatic...

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

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

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

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

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

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...