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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 tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

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

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

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

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

A type of cloud consisting mostly of small particles such as ice particles.