- 行业: 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 forecast of one or more specific meteorological elements for a specified time period and a specified surface or airspace, depicted graphically on a chart.
Industry:Weather
A form of gradient flow where the Coriolis force exactly balances the horizontal pressure force. See geostrophic wind.
Industry:Weather
A fog the droplets of which freeze upon contact with exposed objects and form a coating of rime and/or glaze.
Industry:Weather
A flood that rises and falls quite rapidly with little or no advance warning, usually as the result of intense rainfall over a relatively small area. Some possible causes are ice jams, dam failure, and topography.
Industry:Weather
A flash of green light seen on or (seemingly) adjacent to the upper rim of the low sun (at either sunrise or sunset). The green flash is a mirage, but the image formed in this case is of a portion of the sun rather than of an earthbound object. In addition to the displacement and distortion that is characteristic of mirages, there is also significant dispersion. The upper edge of the low sun normally has a thin green rim (occasionally blue) that is too narrow to be seen by the naked eye unless the rest of the sun is obstructed, say, by the horizon. It is often asserted that the green flash is seen in this way: a mere transient view of the green rim between obscuration by the rest of the sun and obstruction by the horizon. Yet such a sequence produces a singularly poor flash. Rather, the remarkable flashes always seem to involve multiple and magnified images of the green rim. Indeed, the presence of such multiple images of a small portion of the sun is a good indicator of a forthcoming flash. The optical signature of multiple images is a serrated edge to the sun. The refraction that displaces the image of the low sun up from the position it would occupy in the absence of an atmosphere does so more strongly for shorter wavelengths. This leads to a red rim on the bottom of the sun and a blue or green rim on the top.
Industry:Weather
A device for the measurement of lightning-stroke current as a function of time. It consists of a number of magnetic links mounted on the perimeter of a rapidly rotating wheel that is located close to the conductor bearing the lightning surge. The resolution of the instrument is sufficient to determine current peaks as a function of time, but not the current wave shape.
Industry:Weather
