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 line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.
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A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...