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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Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...
Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...
A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.
The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....
The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...
A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...
A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.
An instrument for measuring atmospheric pressure.
Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...
A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...