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 percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.
A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.
The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...
A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...
The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...
A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...
A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...
A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...
A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...
A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...