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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

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

Snow that rises to 8 feet or higher.

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

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

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

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

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.