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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Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...
A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...
The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...
A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...
A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...
Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...
A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...
The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.