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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An instrument for measuring atmospheric pressure.
A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...
In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...
An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...
A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....
The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...
A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...
Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...