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.
Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.
The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...
A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.