- Industry: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
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 means of representing wind speed in the plotting of a synoptic chart; it is a triangular flag, or pennant, drawn pointing toward lower pressure from a wind-direction shaft. In the five-and-ten system, a pennant represents 50 knots and replaces five barbs.
Industry:Weather
A mathematical or computational description of radiative transfer that produces radiation products for specified atmospheric conditions. They may be relatively simple approximations, as in the two stream and delta Eddington models, which are basically monochromatic models. More complicated broadband models include the correlated-k, and more complicated scattering models include Monte Carlo models. Use of radiation models has replaced earlier use of radiation charts.
Industry:Weather
A mathematical model of the variation of dissolved oxygen in a stream due to a point load of waste discharge. The waste discharge can be characterized by biochemical oxygen demand (BOD) or chemical oxygen demand (COD) and its decay coefficient. The natural aeration of the stream is also included. The equation gives the sag in the dissolved oxygen in the water as a function of the distance from the point load.
Industry:Weather
A maritime air mass that develops over or near the polar region.
Industry:Weather
A map projection consisting of a set of overlays, used with radar displays, to compensate for the possibility of second-trip echoes. The overlays, shifted in range by multiples of the maximum unambiguous range, make it possible to determine where range-aliased echoes are in relation to cities, political boundaries, or other features commonly plotted on radar displays. If radar echoes are automatically dealiased, the Rinehart projection need not be used.
Industry:Weather
A manual technique designed to estimate rainfall from convective precipitating systems using consecutive enhanced infrared imagery from GOES.
Industry:Weather
A major category (the ''D'' climates) in W. Köppen's climatic classification, defined by a coldest-month mean temperature of less than −3°C (26. 6°F) and a warmest-month mean temperature of greater than 10°C (50°F). The first limit separates it from temperate rainy climates, and the second from tundra climates. It is distinguished from the dry climates by a function of annual temperature and precipitation (see formulas under steppe climate). The outstanding feature of these climates is the cold winters with at least a month of snow-covered ground. These are the coldest of the tree climates. In C. W. Thornthwaite's classifications, this general type of climate would be 1) in the 1931 system, humid or subhumid and microthermal climate, or taiga climate; and 2) in the 1948 system, humid or moist subhumid and microthermal climate.
Industry:Weather
A magnetometer of the electromagnetic type that is used to measure the horizontal intensity of the earth's magnetic field. The instrument serves as a national standard for measurement of this quantity.
Industry:Weather
A low-level, horizontal, wedge-shaped arcus cloud associated with a convective storm's gust front (or occasionally a cold front). The shelf cloud is attached to the convective storm's cloud base. Rising motion can be seen in the leading (outer) part of the shelf cloud, while the underside appears turbulent and tattered. Compare roll cloud.
Industry:Weather
A low-level southwesterly jet over the Arabian Sea in the summer months, off the coast of Somalia. It is the northern branch of a cross-equatorial flow, giving rise to a major supply of moisture in support of the Asian summer monsoon.
Industry:Weather
