What is Tropical Cyclone?

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a “tropical depression” when wind speeds are 38 miles per hour or less, tropical cyclones are characterized by a low-pressure center and can produce torrential rains, high winds and storm surges.

Glossary

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...

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

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

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

The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...

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

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...

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

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

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