- Industry: Weather
- Number of terms: 60695
- Number of blossaries: 0
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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 region of negative buoyancy below an existing level of free convection (LFC) where energy must be supplied to the parcel to maintain its ascent. This tends to inhibit the development of convection until some physical mechanism can lift a parcel to its LFC. The intensity of the cap is measured by its convective inhibition. The term capping inversion is sometimes used, but an inversion is not necessary for the conditions producing convective inhibition to exist.
Industry:Weather
One of several days on which the weather is supposed (according to folklore) to provide the key for the weather of a subsequent period. The best-known of these days are in the United States, Groundhog Day (2 February); in England, St. Swithin's Day (15 July). Similar beliefs are associated with other days, mostly saints' days, in many countries. Compare singularity.
Industry:Weather
One of several days on which the weather is supposed (according to folklore) to provide the key for the weather of a subsequent period. The best-known of these days are in the United States, Groundhog Day (2 February); in England, St. Swithin's Day (15 July). Similar beliefs are associated with other days, mostly saints' days, in many countries. Compare singularity.
Industry:Weather
A map that preserves angles; that is, a map such that if two curves intersect at a given angle, the images of the two curves on the map also intersect at the same angle. On such a map, at each point, the scale is the same in every direction. Shapes of small regions are preserved, but areas are only approximately preserved (the property of area conservation is peculiar to the equal-area map). The most commonly used conformal map is probably the Lambert conic projection, with standard latitudes at 30°and 60°N. On the standard latitudes, the scale is exact; between them, it is decreased by not more than about 1%; outside them, distortion increases rapidly. The Mercator and stereographic projections are also conformal maps.
Industry:Weather
A map that preserves angles; that is, a map such that if two curves intersect at a given angle, the images of the two curves on the map also intersect at the same angle. On such a map, at each point, the scale is the same in every direction. Shapes of small regions are preserved, but areas are only approximately preserved (the property of area conservation is peculiar to the equal-area map). The most commonly used conformal map is probably the Lambert conic projection, with standard latitudes at 30°and 60°N. On the standard latitudes, the scale is exact; between them, it is decreased by not more than about 1%; outside them, distortion increases rapidly. The Mercator and stereographic projections are also conformal maps.
Industry:Weather
The synoptic chart for any constant-pressure surface, usually containing plotted data and analyses of the distribution of, for example, height of the surface, wind, temperature, and humidity. Constant-pressure charts are most commonly known by their pressure value; for example, the 1000-mb chart (which closely corresponds to the surface chart), the 850-mb chart, 700-mb chart, 500-mb chart, etc. Compare constant-height chart; see mandatory level.
Industry:Weather
The synoptic chart for any constant-pressure surface, usually containing plotted data and analyses of the distribution of, for example, height of the surface, wind, temperature, and humidity. Constant-pressure charts are most commonly known by their pressure value; for example, the 1000-mb chart (which closely corresponds to the surface chart), the 850-mb chart, 700-mb chart, 500-mb chart, etc. Compare constant-height chart; see mandatory level.
Industry:Weather
A lightning discharge occurring between a positively charged region and a negatively charged region, both of which may lie in the same cloud. The most frequent type of cloud discharge is one between a main positively charged region and a main negatively charged region. Cloud flashes tend to outnumber cloud-to-ground flashes. In general, the channel of a cloud flash will be wholly surrounded by cloud. Hence, the channel's luminosity typically produces a diffuse glow when seen from outside the cloud and this widespread glow is called sheet lightning.
Industry:Weather
A lightning discharge occurring between a positively charged region and a negatively charged region, both of which may lie in the same cloud. The most frequent type of cloud discharge is one between a main positively charged region and a main negatively charged region. Cloud flashes tend to outnumber cloud-to-ground flashes. In general, the channel of a cloud flash will be wholly surrounded by cloud. Hence, the channel's luminosity typically produces a diffuse glow when seen from outside the cloud and this widespread glow is called sheet lightning.
Industry:Weather
The splitting of rocks as the result of the freezing of the water contained in them. The individual fragment produced by this process is called a congelifract.
Industry:Weather
