- 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, ...
1. A system of air navigation whereby a flight is accomplished using a single value of compass heading. The heading must be so determined that it compensates for the net effect of the wind en route. It should also be noted that a single-heading course rarely coincides with a great-circle course, except in grid navigation. Single-heading navigation is not necessarily economical in terms of least time, but its advantage lies in its simplicity. Compare single drift correction. 2. Same as aerologation.
Industry:Weather
1. A supercooled fog that deposits rime on exposed objects. See fog deposit. 2. Same as ice fog.
Industry:Weather
1. A strong wind characterized by a sudden onset, a duration of the order of minutes, and then a rather sudden decrease in speed. In U. S. Observational practice, a squall is reported only if a wind speed of 16 knots or higher is sustained for at least two minutes (thereby distinguishing it from a gust). See line squall, white squall, williwaw. 2. In nautical use, a severe local storm considered as a whole, that is, winds and cloud mass and (if any) precipitation, thunder and lightning. See squall line, arched squall, black squall, sumatra, Abrolhos squalls.
Industry:Weather
1. A space capable of storing a fluid. 2. A supply of a substance, especially a reserve or extra supply. 3. A natural or man-made lake that serves to store water; often the release is controlled so that withdrawals can be managed.
Industry:Weather
1. A specified portion of a stream channel, commonly taken between two stream gauging stations, but may be taken between any two specified endpoints. 2. In hydraulic and sediment transportation calculations, a reach of stream is a specified length of a stream channel used for computational purposes such as flood routing.
Industry:Weather
1. A region of low pressure with a weak horizontal gradient. 2. Low pressure at the earth's surface that may be reflected aloft as a trough in only the lower levels of the atmosphere.
Industry:Weather
1. A single traversal of the electron beam along any coordinate axis on the face of a cathode-ray oscilloscope. 2. A single rotation of an antenna at fixed azimuth or elevation.
Industry:Weather
1. A gravity wave formed on the free surface of a fluid. In classical hydrodynamics, to distinguish surface waves from tidal waves, the condition is imposed that vertical accelerations are not negligible. Dynamically, this wave is similar to that on an interface separating two fluids, becoming identical in the case of zero density in the upper fluid. 2. See ground wave. 3. A wave at the interface of a light and a much heavier fluid, in particular of the air–sea interface. See surface gravity wave.
Industry:Weather
1. A hypothetical vertical distribution of atmospheric temperature, pressure, and density that, by international agreement, is taken to be representative of the atmosphere for purposes of pressure altimeter calibrations, aircraft performance calculations, aircraft and missile design, ballistic tables, etc. The air is assumed to obey the perfect gas law and the hydrostatic equation, which, taken together, relate temperature, pressure, and density variations in the vertical. It is further assumed that the air contains no water vapor and that the acceleration of gravity does not change with height. This last assumption is tantamount to adopting a particular unit of geopotential height in place of a unit of geometric height for representing the measure of vertical displacement, for the two units are numerically equivalent in both the metric and English systems, as defined in connection with the standard atmosphere. The current standard atmosphere is that adopted in 1976 and is a slight modification of one adopted in 1952 by the International Civil Aeronautical Organization (ICAO), which, in turn, supplanted the NACA Standard Atmosphere (or U. S. Standard Atmosphere) prepared in 1925. It assumes sea level values as follows:
Industry:Weather
1. A region in which the synoptic eddy activity is statistically and locally most prevalent and intense. It also roughly corresponds to the mean trajectory of the cyclones in winter. In winter, there are two storm tracks in the Northern Hemisphere centered at about 45°N, one over the Pacific Ocean and the other over the Atlantic Ocean. There is one storm track in the Southern Hemisphere over the South Indian Ocean region at about 50°S prevalent throughout most of the year. 2. The path followed by a meteorological phenomenon, for example, a center of low atmospheric pressure, a severe thunderstorm, a tornado.
Industry:Weather
