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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 measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...

A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...

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

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

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

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

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