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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 mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

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

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

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...