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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

A cloud of irregular appearance, composed of irregular cloud fragments.

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

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...

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

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

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

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

A large body of air having similar horizontal temperature and moisture characteristics.

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...