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 long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
A distinct layer in a body of water where the temperature changes rapidly with depth, separating warmer surface water from...
Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.
A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...
A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or...
A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...
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 cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...
Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...