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What is Heat Index?

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

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Glossary

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

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

A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

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

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

The branch of science dealing with the laws of motion of air or other gases.

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

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...