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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

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

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

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

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

Nimbostratus clouds are thick, dark, gray clouds associated with rainy and gloomy days that block the Sun. These clouds,...

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

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

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

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...