- 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 flight condition wherein an aircraft is operated under modified visual flight rules while in flight above a layer of clouds and/or an obscuring phenomenon sufficient to constitute a ceiling. The limiting conditions for flying “VFR on top” are prescribed in Civil Air Regulations. Compare VFR between layers.
Industry:Weather
A fixed support for mounting maximum and minimum thermometers of the liquid-in-glass type. The support holds the thermometers at the correct operating attitude and also permits their rotation for resetting when desired.
Industry:Weather
A first-order rate coefficient that relates the rate of removal of a gas or particle from the atmosphere via wet deposition to its concentration. That is, the rate of removal of the substance (in units of concentration divided by time) is directly proportional to the product of its concentration and the washout coefficient (units of inverse time).
Industry:Weather
A facsimile trace of a vertically directed radar, specifically, a cloud-detection radar. See time–height indicator, time section.
Industry:Weather
A faint, constant glow seen in the twilight sky and associated with airglow.
Industry:Weather
A display of data taken in one of the water vapor channels, for example, 6. 7 or 7. 3 μm. Atmospheric water vapor absorbs outgoing radiation in these regions, resulting in a decreased temperature being sensed by the satellite.
Industry:Weather
A direct cell oriented along the equator; originally used by Bjerknes (1969) to refer to the cell induced by the contrast between the warm waters of the western Pacific and the cooler waters of the eastern Pacific. Variability in this cell is associated with the Southern Oscillation. The term is now sometimes used to refer to the entire chain of east–west equatorial circulation cells that stretches around the globe.
Industry:Weather
A device with electrical resistance that varies markedly and monotonically and that possesses a negative temperature coefficient of resistivity. The thermistors commonly used in meteorology are composed of solid semiconducting materials with resistance that decreases 4% per °C. They are constructed in a variety of sizes and may be obtained with thermal time constants of a millisecond or less. Meteorological applications include thermometers, anemometers, and bolometers.
Industry:Weather
A device used to hold liquid-in-glass maximum and minimum thermometers in the proper recording position inside an instrument shelter, and to permit them to be read and reset. See Townsend support.
Industry:Weather
A device used for the generation of signals of any type and form that are to be transmitted. In radio and radar, it is that portion of the equipment that includes electronic circuits designed to generate, amplify, and shape the radio frequency energy that is delivered to the antenna where it is radiated out into space. See receiver.
Industry:Weather
