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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 term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

The term 'cloudy' refers to weather conditions characterized by a significant amount of cloud cover in the sky. This may...

Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...

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

The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...

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

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...