- 行业: Weather
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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 means to illustrate a mesoanalysis. Important mesoscale features in the wind, temperature, moisture, and pressure fields are illustrated on the mesochart by means of contours and/or colored (or black-and-white) shading.
Industry:Weather
A lake that does not mix throughout the total water column; the lower part of the water column is perennially isolated.
Industry:Weather
The climate of a natural region of small extent, for example, valley, forest, plantation, and park. Because of subtle differences in elevation and exposure, the climate may not be representative of the general climate of the region.
Industry:Weather
An anticyclonically rotating vortex, around 2–10 km in diameter, in a convective storm.
Industry:Weather
The representation of temperature, moisture, pressure, and wind variations on horizontal scales of 10–100 km. The analysis seeks to define mesoscale features of the observed temperature, pressure, moisture, and wind fields that can be related to important local and regional circulations that in turn may have a significant impact on local and regional weather systems. The mesoanalysis differs from the more conventional synoptic-scale representation of the wind and pressure features in that smaller- scale features inherent in the wind, pressure, and moisture fields are retained in the analysis.
Industry:Weather
The wind or wind component along the local meridian, as distinguished from the zonal wind. In a horizontal coordinate system fixed locally with the ''x'' axis directed eastward and the ''y'' axis northward, the meridional wind is positive if from the south, and negative if from the north.
Industry:Weather
A measure of the component of air motion along meridians, averaged, without regard to sign, around a given latitude circle. When averaged further over five-day periods, the meridional index in the Northern Hemisphere generally varies between 5 and 20 knots in the lower and middle troposphere in middle latitudes. Compare zonal index.
Industry:Weather
A front in the South Pacific separating successive migratory subtropical anticyclones. Such fronts are essentially in the form of great arcs with meridians of longitude as chords; they have the character of cold fronts. See polar trough.
Industry:Weather
A type of atmospheric circulation pattern in which the meridional (north and south) component of motion is unusually pronounced. The accompanying zonal component is usually weaker than normal. Compare zonal flow, meridional circulation; see meridional index.
Industry:Weather
Exchange by the wind of properties of air, such as heat, momentum, and moisture, between a northern zone and a southern zone in the atmosphere.
Industry:Weather
