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

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

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

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....

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

Nimbostratus clouds are thick, dark, gray clouds associated with rainy and gloomy days that block the Sun. These clouds,...

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