Dark blue cloudy sky

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

A very cold high pressure that originates over the Arctic Ocean.

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

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

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

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

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

A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.

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

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

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...