Dark blue cloudy sky

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

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

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

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

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

The term 'cloudy' refers to weather conditions characterized by a significant amount of cloud cover in the sky. This may...

A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...

A blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

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

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...