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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

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

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

Local winds that blow from slopes to peaks as a result of the heating of the top slopes without being affected by general...

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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

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

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

A middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...