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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

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 amount of water vapor present in the air, which can affect comfort levels and weather conditions.

Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...

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

A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...

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

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

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

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

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