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 polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...
The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...
A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.
Snow that rises to 8 feet or higher.
A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
An instrument for measuring atmospheric pressure.
Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...
A body that has the property of absorbing all electromagnetic radiation falling on it, and therefore is the theoretical body...