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 weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...
Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.
A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...
A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...
The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....
A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...
The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...