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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 weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

Snow that rises to 8 feet or higher.

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

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...

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

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

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...