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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A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.
A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.
A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...
The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...