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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

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

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

The term 'cloudy' refers to weather conditions characterized by a significant amount of cloud cover in the sky. This may...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...

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

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

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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