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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

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

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

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

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

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

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

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

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...

A type of cloud consisting mostly of small particles such as ice particles.

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...