- 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 statement of the actual values of meteorological elements observed at a specified place and time. It is a record of an observation, not a forecast.
Industry:Weather
A Spanish term frequently used to denote a burst of strong offshore (southward) wind, lasting a day or more, that blows from the Gulf of Mexico across the Gulf of Tehuantepec. Tehuano events are associated with winter surges of cold air that spread southward from the United States across the Gulf of Mexico behind strong weather fronts. Tehuanos produce much local cooling of the gulf waters and frequently cause anticyclonic warm-core ocean eddies to form and propagate west-southwestward near 12°–14°N. See papagayo.
Industry:Weather
A south wind of foehn type descending from the Pyrenees in the Ariège valley, France. It is especially violent in February and March when it melts the snow, flooding the rivers, and sometimes causing avalanches. It causes a premature spring that forces the buds on fruit trees, which are subsequently killed by frost. In August and September it comes as a strong drying wind, generally lasting three to four days.
Industry:Weather
A South American nautical term (especially in Chile) for a west wind from the sea; a “side” wind.
Industry:Weather
A sounding balloon that, when operationally inflated, resembles an inverted teardrop. This shape was determined primarily by aerodynamic considerations of the problem of obtaining maximum stable rates of balloon ascension. Such balloons are not commonly used for operational soundings.
Industry:Weather
A solenoidal plane wave '''A''' perpendicular to the propagation direction in the sense that if '''A''' = '''A'''<sub>0</sub>exp(''i'''''k''' • '''x''' − ''i''ω''t''), where '''k''' is the wave vector, then '''k''' × '''A''' = 0. Electromagnetic waves are examples of transverse waves. Acoustic waves in solids have both irrotational and solenoidal components that propagate with different phase velocities. Compare longitudinal wave.
Industry:Weather
A small, movable, graduated scale, adjacent and parallel to the main scale of an instrument, which provides a means for interpolating between the graduations of the main scale. Generally historical, like the slide rule; commonly replaced by digital electronics.
Industry:Weather
A short-duration low-level westerly wind event along and near the equator in the western Pacific Ocean (and sometimes in the Indian Ocean). This surge may last from one day to several days and is closely linked to deep equatorial convection to its east. The westerly wind burst is most common during El Niño years from September to January and in normal years from October to December. It is absent in the Pacific in La Niña years. It is also thought to be associated with the Madden–Julian oscillation. The westerly winds are usually greater than 5 m s<sup>−1</sup>(10 knots), and reach 15 m s<sup>−1</sup>(30 knots) in well- developed systems. These intense westerly wind bursts are associated with a large cluster of deep convective clouds along the equator and are necessary precursors to the formation of tropical cyclone twins symmetric about the equator.
Industry:Weather
