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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 on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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

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

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

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

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

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...

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