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 drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
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A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...
A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...
A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.