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 strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...
The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...
Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.
A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...