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.'

Glossary

Snow that rises to 8 feet or higher.

The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...

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

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

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

Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

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

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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