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What is El Niño?

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global weather patterns, including increased rainfall in some regions and drought in others.

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Glossary

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...

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

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

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

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

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...

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

A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.