- 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, ...
As given by A. Supan in 1879, a belt around the earth within which the annual mean temperature is less than 20°C (68°F) and the mean temperature of the warmest month is higher than 10°C (50°F). These limits separate this belt from the hot belt and cold caps, respectively. See climatic classification.
Industry:Weather
As defined by the World Meteorological Organization in 1956, a station, other than a precipitation station, at which the observations are of the same kind as at a second-order climatological station, but are 1) not so comprehensive; or 2) made once a day only; or 3) made at other than the specified hours. This designation is not used officially in the United States, but types of stations that would fit under this category include climatological substations and certain aeronautical weather reporting stations.
Industry:Weather
As adopted by the International Meteorological Organization, a monthly or annual mean of air temperature based upon hourly observations at a given place, or on some combination of less frequent observations designed to represent this mean as nearly as possible. Compare mean temperature.
Industry:Weather
Any substance existing in the gaseous state at a temperature lower than that of its critical point; that is, a gas cool enough to be liquefied if sufficient pressure were applied to it. If any vapor is cooled sufficiently, say at constant pressure, it ultimately reaches a state of saturation such that further removal of heat is accompanied by condensation to the liquid phase. Except for states quite close to that of saturation, vapors exhibit the general properties of all gases. Quantitatively, however, vapors exhibit measurable departures from perfect-gas laws even in states well removed from that of saturation. Since the critical temperature for water (374°C) is far above any atmospheric temperatures (except for the extreme upper air), all water substance found in the atmosphere in the gaseous state is appropriately called water vapor.
Industry:Weather
Any organic compound the structure of which is derived from the isoprene entity.
Industry:Weather
Any one of a class of diagrams designed to show the distribution of wind direction experienced at a given location over a considerable period; it thus shows the prevailing wind direction. The most common form consists of a circle from which eight or sixteen lines emanate, one for each compass point. The length of each line is proportional to the frequency of wind from that direction, and the frequency of calm conditions is entered in the center. Many variations exist; some indicate the range of wind speeds from each direction; some relate wind directions with other weather occurrences. Compare resultant wind, Lambert's formula.
Industry:Weather
Any of the many types of objects detected by radar. A radar target must have an index of refraction sufficiently different from that of the atmosphere to return a target signal to the radar by reflection, refraction, or scattering. Also, it must be near enough and have a large enough radar cross section that the target signal will exceed the threshold of detectability of the radar receiver. The target is then said to produce a detectable echo.
Industry:Weather
Any device designed to obstruct wind flow and intended for protection against any ill effects of wind. Installations of this type include agricultural shelterbelts, snow fences, and rain-gauge wind shields.
Industry:Weather
Any nonoccluded front, or portion thereof, that moves in such a way that warmer air replaces colder air. While some occluded fronts exhibit this characteristic, they are more properly termed warm occlusions.
Industry:Weather
