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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

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

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

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

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

A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...

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