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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

Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...

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

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

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.