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 jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...
A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...
A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...
A blizzard is a storm that lasts 3 hours or more, with persistent winds/frequent gusts of 35 mph or more along with significant...
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.