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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

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

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

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

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

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

The term used for turbulence occurring in the absence of clouds or cloud-like elements in the visible area. It is often observed...

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

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