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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 large body of air having similar horizontal temperature and moisture characteristics.

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

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

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

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

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

The branch of science dealing with the laws of motion of air or other gases.

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