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

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...

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

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

An instrument for measuring atmospheric pressure.

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

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...