- 업종: Weather
- Number of terms: 60695
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
A simplified representation of the characteristic distribution of temperature, winds, relative humidity, cloudiness, and rainfall associated with typical cold and warm fronts in the atmosphere.
Industry:Weather
A set of points arranged in an orderly fashion on which specified variables are analyzed or predicted. Various forms of horizontal and vertical grids, each with particular characteristics, have been devised for use in numerical weather prediction.
Industry:Weather
A set of flow lines and corresponding intersecting equipotential lines arranged in a prescribed way.
Industry:Weather
A set of frequencies lying within a definite range. See radar frequency bands, radio frequency band.
Industry:Weather
A set of mathematical approximations introduced into a system of hydrodynamical partial differential equations to filter out or exclude solutions corresponding to those physical disturbances that are believed to contribute only negligibly to the problem at hand. In the theory of cyclonic-scale atmospheric flow, for example, the introduction of the quasi- hydrostatic approximation effectively excludes solutions of the equations of motion corresponding to atmospheric sound waves, while the selective use of the quasigeostrophic approximation, as in the vorticity equation with the divergence eliminated, effectively filters out solutions corresponding to high-speed atmospheric gravity waves. Through the use of such filtering approximations, the equations of motion can be focused upon the desired components of the flow.
Industry:Weather
A set where every element's degree of membership is specified by a value between 0 and 1. The elements have different degrees of belonging to the set. For example, membership of a temperature of 0°C in the set “cold” might be 0. 2, but membership of −20°C might be 0. 9.
Industry:Weather
A sequence of long-lived tornadoes produced by a “cyclic” supercell storm. Tornadoes touch down at quasi-regular intervals (typically 45 min). Usually a new tornado develops in a new mesocyclone just after an old tornado has decayed in an old, occluded neighboring mesocyclone. Sometimes, two successive tornadoes may overlap in time for a few minutes. The two mesocyclones may rotate partially around each other. If the damage tracks of the tornadoes appear to form a wavy broken line, the family is classified as a series mode. In the more common parallel-mode family, the damage tracks are parallel arcs with each new tornado forming on the right side of its predecessor. The parallel mode is subcategorized into left turn and right turn, according to the direction in which the paths curve.
Industry:Weather
A seasonal frost mound produced through doming of seasonally frozen ground by a subsurface accumulation of water under high hydraulic potential during progressive freezing of the active layer. (Glossary of Permafrost and Related Ground-Ice Terms, National Research Council of Canada, NRCC 27952, Technical Memorandum No. 142, 1988. )
Industry:Weather
A sequence of interactions that determines the response of a system to an initial perturbation. Feedbacks may either amplify (positive feedback) or reduce (negative feedback) the ultimate state of the system.
Industry:Weather
