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

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

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

A cloud of irregular appearance, composed of irregular cloud fragments.

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...

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

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...