Noun | 1. | ![]() cloud - a visible mass of water or ice particles suspended at a considerable altitude physical phenomenon - a natural phenomenon involving the physical properties of matter and energy air hole, air pocket, pocket - a local region of low pressure or descending air that causes a plane to lose height suddenly aurora - an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force condensate, condensation - atmospheric moisture that has condensed because of cold front - (meteorology) the atmospheric phenomenon created at the boundary between two different air masses greenhouse effect, greenhouse warming - warming that results when solar radiation is trapped by the atmosphere; caused by atmospheric gases that allow sunshine to pass through but absorb heat that is radiated back from the warmed surface of the earth inversion - the layer of air near the earth is cooler than an overlying layer storm, violent storm - a violent weather condition with winds 64-72 knots (11 on the Beaufort scale) and precipitation and thunder and lightning atmospheric electricity - electrical discharges in the atmosphere midnight sun - the sun visible at midnight (inside the Arctic or Antarctic Circles) halo - a circle of light around the sun or moon meteor shower, meteor stream - a transient shower of meteors when a meteor swarm enters the earth's atmosphere sunrise - atmospheric phenomena accompanying the daily appearance of the sun sunset - atmospheric phenomena accompanying the daily disappearance of the sun afterglow - a glow sometimes seen in the sky after sunset atmospheric condition, weather, weather condition, conditions - the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation; "they were hoping for good weather"; "every day we have weather conditions and yesterday was no exception"; "the conditions were too rainy for playing in the snow" |