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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 reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

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

A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.

An instrument for measuring atmospheric pressure.