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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

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

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

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...

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

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

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...