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 long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...
A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...
A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...
Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...
A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.