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 rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
A thin, white cloud layer that is intertwined or separate, arranged in regular order, and does not cast a shadow.
The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...
Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...
Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.
A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.
The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.