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

The term used for turbulence occurring in the absence of clouds or cloud-like elements in the visible area. It is often observed...

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

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

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

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

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

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

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

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...