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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 percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

An instrument for measuring atmospheric pressure.

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

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

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

The large-scale movement of air that distributes heat and moisture around the Earth, influencing weather patterns and climatic...

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