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 measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...
The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...
A type of cloud consisting mostly of small particles such as ice particles.
A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...
Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.
A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...
Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.