- 行业: Weather
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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 code, used primarily in French North Africa, in which data on contours of constant pressure or prognostic contours are encoded and transmitted. Except in key words, it is identical with the international analysis code insofar as symbolic form is concerned.
Industry:Weather
A code in which data on the 0° and −10°C isotherms are encoded and transmitted. It is a modification of the international analysis code.
Industry:Weather
A cloud vortex generated on the lee of an island barrier under conditions of a low-level temperature inversion. The flow frequently forms a trail of counterrotating vortices, alternately placed in two parallel rows.
Industry:Weather
A cloud layer of ten-tenths (1. 0) coverage as viewed from an observation point above the layer. The term is most generally used in pilot reporting of in-flight weather conditions.
Industry:Weather
A cloud species unique to the genus cirrus. See cloud classification, cirrus uncinus.
Industry:Weather
A cloud variety (applied mainly to the genus cirrus), the elements of which are arranged in a manner suggestive of vertebrae, ribs, or a fish skeleton. See cloud classification.
Industry:Weather
A cloud variety occurring in a layer, patch, or extensive sheet, the greater part of which is sufficiently translucent to reveal the position of the sun, or through which higher clouds may be discerned. This variety is found in the genera altocumulus, altostratus, stratocumulus, and stratus, and is usually a modification of the species stratiformis or lenticularis. (Note: With the exception of cirrus spissatus, all cirriform clouds are inherently translucent. ) See cloud classification.
Industry:Weather
A chart depicting winds in the upper levels of the atmosphere, often including wind speed, wind direction, or both.
Industry:Weather
A characteristic temperature inversion usually present in the trade-wind streams over the eastern portions of the tropical oceans. It is found in large-scale subsiding flows constituting the descent branches of the Hadley cell and Walker circulation. The subsidence warming in the inversion layer is balanced by radiative cooling and evaporation from the tops of trade cumuli. The height of the base of this inversion varies from about 500 m at the eastern extremities of the subtropical highs to about 2000 m at the western and equatorial extremities. In the equatorial trough zone and over the western portions of the trade-wind belt, the inversion does not exist as a mean condition, although it appears in certain weather patterns. The strength of the inversion varies enormously, occasionally being more than 10°C over 1 km, but sometimes being absent altogether, especially in the Northern Hemisphere. The inversion is generally strongest when the height of its base is lowest, and vice versa. The thickness of the inversion layer varies from only a few meters to more than 1000 m. On the average its thickness is about 400 m. The airflow below the inversion is very moist and filled with cumulus clouds (trade cumuli). Above it, the air is warm and exceedingly dry; this structure is so characteristic of the trade current that tropical analysts think of the tropical troposphere as consisting of a lower moist and an upper dry layer.
Industry:Weather
