Dark blue cloudy sky

What is Arctic Air?

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

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Glossary

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

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

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

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

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

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

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...