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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

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...

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

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...

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

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

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