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 state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.
An instrument for measuring atmospheric pressure.
The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.
A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...
A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...
A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
A very cold high pressure that originates over the Arctic Ocean.
The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...
A type of cloud consisting mostly of small particles such as ice particles.
Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...