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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

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

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

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

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

The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...

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

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...

Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.

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

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