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

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

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

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

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

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

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...