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

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A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...

An instrument for measuring atmospheric pressure.

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A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

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

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...