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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 cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

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

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

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

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

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

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

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.