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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

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...

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

Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.

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

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

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

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

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

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