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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Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...
A narrow band of strong winds in the upper atmosphere, typically flowing from west to east and influencing weather patterns.
The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...
The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.
A mass of very cold, dry air that mostly originates over the Arctic Ocean.
Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...
Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...
A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...