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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The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...
A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...
A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...
Air laden with sand and dust, common in areas devoid of permanent vegetation, especially deserts.
A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
A very cold high pressure that originates over the Arctic Ocean.
A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...
The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...
A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.