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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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

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

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

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

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.

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