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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

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

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...

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

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

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

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