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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 closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

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

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

A cloud of irregular appearance, composed of irregular cloud fragments.

The amount of water vapor present in the air, which can affect comfort levels and weather conditions.

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

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

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