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 closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...
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 rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.
A blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...
The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....
A very cold high pressure that originates over the Arctic Ocean.
A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...
A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...
Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.
A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...