- 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, ...
The length of time between the issuance of a forecast and the occurrence of the phenomena that were predicted.
Industry:Weather
The level of groundwater in an unconfined aquifer below which the porous medium is saturated.
Industry:Weather
The line of intersection of a front (frontal surface) with a specified surface in the atmosphere, usually a constant-pressure surface. With respect to only one surface, this line is usually called, simply, the front. A frontal-contour chart is a single synoptic chart on which are drawn all available frontal contours, thereby clearly showing the three-dimensional configuration of all fronts within the area of the chart. Compare frontal profile.
Industry:Weather
The leeward edge of the orographic stratiform cap cloud as seen from the lee side of a mountain barrier, preceding or during a foehn or chinook event. The edge is generally abrupt and resembles a wall of cloud (“foehnwand” in German). This cloud often signifies the occurrence of orographic precipitation, especially snowfall in the cold season, over the peaks. See foehn cloud.
Industry:Weather
The leading edge of a mesoscale pressure dome separating the outflow air in a convective storm from the environmental air. This boundary, which is marked by upward motion along it and downward motion behind it, is followed by a surge of gusty winds on or near the ground. A gust front is often associated with a pressure jump, wind shift, temperature drop, and sometimes with heavy precipitation. Gust fronts are often marked by arcus clouds.
Industry:Weather
The layer of the ionosphere that exists as an appendage on the lower part of the F2-layer during the day. It exhibits a distinct maximum of free-electron density, except at high latitudes in winter, when it is not detectable. Its virtual height ranges from 200 to 300 km, being lowest at around noon. The F1-layer is formed by absorption of solar radiation in the extreme ultraviolet (EUV) range of wavelengths and is often roughly similar in shape to an idealized Chapman layer.
Industry:Weather
The layer of ground subject to seasonal freezing. In regions of permafrost, this corresponds to the active layer.
Industry:Weather
The junction between land ice (such as an ice sheet or glacier) and floating ice (such as an ice shelf, fast ice, or sea ice).
Industry:Weather
The interval in time between consecutive cycles of tidal floods. See also flood current.
Industry:Weather
