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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 middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...

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

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

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

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

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

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

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

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

The large-scale movement of air that distributes heat and moisture around the Earth, influencing weather patterns and climatic...