- 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, ...
Fog formed as a result of evaporation of water that is warmer than the air. If formed over a water surface, it is sometimes termed steam fog. If formed from evaporation of rain falling through the air, it is sometimes termed rain fog, precipitation fog, or frontal fog.
Industry:Weather
1. Frost caused by evaporative cooling due to dry winds over a moist surface, where the wind temperature is above freezing, but cooling below freezing occurs due to latent heat loss. 2. Agricultural term, where evaporation freezes the crop.
Industry:Weather
A simple wave or progressive disturbance in the isentropic flow of a compressible fluid, such that the pressure and density of a fluid particle decrease on crossing the wave in the direction of its motion. This may be illustrated, for example, by the withdrawal of a piston from a gas-filled cylinder. When the gas is initially at rest in the cylinder, an expansion wave may move into the undisturbed fluid at the speed of sound as the piston is withdrawn. The expansion wave is a finite-amplitude disturbance changing shape as it propagates, but it may or may not be accompanied by a shock wave front, with the associated discontinuities. See compression wave.
Industry:Weather
Any property of a parcel or system that is a function of the mass of the system, for example, kinetic or internal energy. See intensive quantity.
Industry:Weather
A balloon made of a material of low modulus of elasticity such as natural or synthetic rubber. Sounding balloons made of rubber expand to five or six times their flaccid diameter before bursting.
Industry:Weather
A producer of pollutants with an emission orifice generally more than about 10 m in size. Examples include two-dimensional “area” sources such as agricultural and forest burning, volatile organic emissions from lagoons or other water treatment areas, and other open, expansive emission sources, or three-dimensional “volume” sources such as open buildings, tanks with several orifices, and other such structures.
Industry:Weather
Drying up by the removal of moisture. In climatology it implies the loss of moisture by draining or by increased evaporation, rather than by a decreased supply of water from precipitation. Compare desiccation.
Industry:Weather
A forecast of weather conditions for a period extending beyond three or more days from the day of issuance. The U. S. National Weather Service issues extended forecasts for the three- to five-day period ahead. Compare long-range forecast, medium-range forecast.
Industry:Weather
The appropriate placement of an instrument so that its indications represent the real state of the atmosphere unmodified by nearby influences.
Industry:Weather
1. A qualitative term referring to the surroundings of a site, especially to how well its openness will allow in situ measurements made at that site to represent the general area. Exposure is of particular concern for wind, temperature, precipitation, and radiation measurements. See instrument exposure. 2. The amount of time an individual is affected by a particular phenomenon, such as exposure to sunlight as affects UV-induced sunburn, air pollutants, or nuclear radiation. 3. See instrument exposure.
Industry:Weather
