- 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, ...
Convective storm that contains similar radar characteristics to those of a supercell (e.g., hook echo, WER, BWER), but is significantly smaller in height and width. The diameter of the radar-detected rotation is 1–8 km. This is a relatively new storm type, the existence of which has been confirmed by data from the recently installed WSR–88D radars in the United States. Mini-supercells occur in areas where the height of the equilibrium level is low, most often in the northern United States, but possibly under certain weather conditions in any area of the world. They are sometimes found in landfalling tropical cyclones.
Industry:Weather
A thermometer that automatically registers the lowest temperature attained during an interval of time. The alcohol-in-glass minimum thermometer contains a dumbbell-shaped index that is kept on the bulb side of the meniscus by surface tension. The thermometer is installed in a horizontal mounting (see Townsend support) so that as the temperature falls, the index is pulled toward the bulb and remains at the minimum point as the temperature rises. A bimetallic thermometer with a circular dial is also used as a minimum thermometer. A free index, mounted concentrically with and driven by the thermometer index, is held by friction at the minimum temperature. Compare maximum thermometer.
Industry:Weather
The smallest observed streamflow value during a water year. May be either an instantaneous value, the smallest 24-hour average, or an average over a longer period of time.
Industry:Weather
The minimum total deviation, relative to neighboring deviations, of an incident wave (or ray) transmitted by a bounded, optically homogeneous body (e.g., prism, ice crystal, raindrop). The corresponding angle between the direction of the incident wave and that transmitted by the body is the angle of minimum deviation. Rainbows and arcs of 22° are, according to geometrical optics, formed at angles of minimum deviation.
Industry:Weather
The lowest temperature attained at a specific location during a specified period.
Industry:Weather
The set of headings for which the flight time from departure to destination is minimum. See minimal flight, wave-front method.
Industry:Weather
The least value attained (or attainable) by a function; the opposite of maximum. (See further discussion under maximum. )
Industry:Weather
In air navigation, the route that yields the least travel time between two points, for the expected weather conditions.
Industry:Weather
Ideally, an aircraft flight so planned and navigated that is completed in the least possible time. Such planning should take into consideration the complete three-dimensional wind pattern en route as related to aircraft operating characteristics. To date, however, minimal flight is still largely a two-dimensional (pressure-pattern flight) concept. One practical method of determining a minimal flight path is the wave-front method. Compare optimum flight.
Industry:Weather
A unit of distance equal to 5280 ft or 1. 609 km; commonly known as statute mile. Compare nautical mile.
Industry:Weather
