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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 upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

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

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

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

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

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...

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

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