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

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

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

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

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

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

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

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

A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...

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

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.