- 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 condition of visibility restriction caused by an overspreading mass of smoke that produces a gloomy effect.
Industry:Weather
A condensation nucleus of a very hygroscopic nature produced by partial or complete desiccation of particles of sea spray or of seawater droplets derived from breaking bubbles. That such nuclei are important in condensation processes over the oceans and near coasts is fairly well established, but it appears that they are not in general the source of nuclei in condensation over continental interiors.
Industry:Weather
A combination maximum thermometer and minimum thermometer. The tube is shaped in the form of a “U” having a bulb at either end. One bulb is filled with a clear liquid that expands or contracts with temperature variation, forcing before it a short column of mercury having iron indices at either end. The indices remain at the extreme positions reached by the mercury column, thus indicating the maximum and minimum temperatures. The indices can be reset with the aid of a magnet.
Industry:Weather
A common type of fog, produced over a land area when radiational cooling reduces the air temperature to or below its dewpoint. Thus, a strict radiation fog is a nighttime occurrence, although it may begin to form by evening twilight and often does not dissipate until after sunrise. Factors favoring the formation of radiation fog are 1) a shallow surface layer of relatively moist air beneath a dry layer and clear skies, and 2) light surface winds. It can be most confusing near sea coasts with cold coastal water. It can be difficult at times to differentiate between this and other types of fog, especially since nighttime cooling intensifies all fogs. Radiation fog is frequently and logically called ground fog, but in U. S. Weather observing practice, the latter term is defined only with respect to the amount of sky that is obscured by the fog.
Industry:Weather
A combination of thick mist (or fog) and heavy drizzle occurring frequently in Scotland and in parts of England. In the Devon-Cornwall peninsula, the same phenomenon is referred to as “mizzle. ”
Industry:Weather
A colloquial term for a brief period of extreme (generally cold) weather setting in suddenly, as in a “cold snap. ”
Industry:Weather
A coefficient relating the amount of runoff to the amount of precipitation received. See rational method.
Industry:Weather
