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

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.

An instrument for measuring atmospheric pressure.

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

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

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

The branch of science dealing with the laws of motion of air or other gases.

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.