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What is La Niña?

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global weather patterns such as reduced rainfall in some areas and increased rainfall in others.

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Glossary

Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...

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

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

A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...

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

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...