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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 cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...

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

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

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

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.