- 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, ...
A rectangular radar display, with coordinates of azimuth and range, in which targets appear as intensity-modulated blips. <br>Because the shapes of distributed targets are distorted on these coordinates, especially at close range, this type of display is not popular for use in weather radar.
Industry:Weather
1. A wave disturbance in a two-dimensional flow, the driving mechanism for which lies in the variation of vorticity of the basic current and/or in the variation of the vorticity of the earth about the local vertical. Such wave disturbances are also known as Rossby waves. See also barotropic instability. 2. An atmospheric wave of cyclonic scale in which troughs and ridges are approximately vertical.
Industry:Weather
With reference to fog or low stratus cloud layers, to dissipate by heating from the sun, primarily during the early morning hours.
Industry:Weather
Weather conditions below the minimums prescribed by regulation for the particular action involved, for example, landing minimums, takeoff minimums.
Industry:Weather
Weakly luminous upward propagating discharges, blue in color, emanating from the tops of thunderstorms. Following their emergence from the top of the thundercloud, they typically propagate upward in narrow cones of about 15° full width at vertical speeds of roughly 100 km s−1 (Mach 300), fanning out and disappearing at heights of about 40–50 km. Their intensities are on the order of 800 kR near the base, decreasing to about 10 kR near the upper terminus. These correspond to an estimated optical energy of about 4 kJ, a total energy of about 30 MJ, and an energy density on the order of a few millijoules per cubic meter. Blue jets are not aligned with the local magnetic field.
Industry:Weather
Water droplets displaced by the wind from a body of water, generally from the crests of waves, and carried up into the air in such quantities that they reduce the horizontal visibility to less than 11 km (about 7 statute miles). It is encoded as BY as an obstruction to vision in surface aviation weather observation and as BLPY as an obstruction to vision in a METAR or SPECI observation.
Industry:Weather
Waves that can exist within a solid or fluid body without boundary surfaces or interfaces. Propagation of information and energy in such waves is generally possible in all radial directions, but may for some types of waves be influenced by forces of, for example, gravitation and rotation. In the ocean, the most common body waves are sound waves, light waves penetrating through the ocean surface, and internal gravitational waves.
Industry:Weather
Water containing total dissolved salts in the range 1000–10 000 mg−1.
Industry:Weather
Water absorbed and stored by the soil pores of the bed and banks of a stream, lake, or reservoir during higher stage periods and returned, fully or partially, to the water body as the water stage falls.
Industry:Weather
