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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Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...
A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...
A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...
The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...
The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.