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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

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

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

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

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

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

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

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