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

An instrument for measuring atmospheric pressure.

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...

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

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

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

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

Perhaps you have come across them, maybe you are seeing them for the first time. These clouds, known as wave clouds, resemble...

The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...