Dark blue cloudy sky

What is Clear?

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility. Clear sky. In meteorology, this term is also used when the cloud cover is less than 1/8 during the day or at the observation hour.

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Glossary

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

The amount of water vapor present in the air, which can affect comfort levels and weather conditions.

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...

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

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...