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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The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.
A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.
A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.
The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
A type of cloud consisting mostly of small particles such as ice particles.
Temperature scale, abbreviated as °C, found by accepting the freezing point of water at one atmospheric pressure as zero...