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 upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...
A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...
A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...
Snow that rises to 8 feet or higher.
The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...
Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...
An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...
A very cold high pressure that originates over the Arctic Ocean.