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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 line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

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

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

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

A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....

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

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...