- 行业: 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 weighing-recording rain gauge that mechanically converts the depth of accumulated precipitation during a given period of time to a code disk position. The code disk position is recorded on punched paper tape at selected intervals. The time interval of recording is 15 minutes and the accumulated precipitation is read to the nearest 2. 5 mm (0. 10 in. ). The gauge can be modified for remote transmission.
Industry:Weather
A weak radar echo in the form of a tapered radial extension beyond the far edge of a severe thunderstorm, associated with the presence of large hydrometeors, especially hail, in the storm. The phenomenon is explained by what is referred to as “three-body scattering. ” Some of the radar energy is scattered from the hail region to the ground, reflected back to the hail region, and then scattered a third time, eventually returning to the radar as a weak signal. From the perspective of the radar, the signal travels out and back with a timing indicating that the scattering region is beyond the back edge of the storm. Flare echoes are observed more commonly with radars operating at shorter wavelengths, evidently because of deviations from Rayleigh scattering.
Industry:Weather
A weather forecast for the five-day period ahead. This term is most often used by the media.
Industry:Weather
A type of snow crust; a very thin layer of ice upon a snow surface, formed by the freezing of meltwater or rain into a continuous film; not as thick as an ice crust.
Industry:Weather
A unit measure of a basic physical quantity such as mass, length, time; for example, one gram, one centimeter, one second, respectively. Other quantities, such as temperature, may be considered fundamental and assigned a fundamental unit.
Industry:Weather
A unit of illuminance or illumination equal to one lumen per square foot. This is the illuminance provided by a light source of luminous intensity one candela (formerly candle) at a distance of 1 ft, hence the name. Full sunlight with zenith sun produces an illuminance of about 10 000 foot-candles on a horizontal surface. Full moonlight provides an illuminance of about 0. 02 foot-candles. Adequate illumination for reading is taken to be about 10 foot-candles; that for machine shop work is about 40 foot-candles. Compare lux.
Industry:Weather
A unit of luminance (or brightness) equal to 1/π candles ft−2. In the United Kingdom this is also called the equivalent foot-candle.
Industry:Weather
A variational objective analysis of the atmospheric state performed in the three space dimensions and the time dimension with a forecast model usually used to exactly constrain the solution in time.
Industry:Weather
