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 type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...
A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...
Snow that rises to 8 feet or higher.
The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...