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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

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

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.