- 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, ...
In English folklore, a day that is popularly supposed to govern the weather of the succeeding 40 days; specifically, if it rains on St. Swithin's Day, 15 July, it will continue to rain for 40 days. Not even a tendency toward this is borne out by weather records. Similar legends relate to other saints' days in many countries. See control day.
Industry:Weather
In contrast to the methods of visual photometry, an objective approach to the problems of photometry, wherein any of several types of photoelectric devices are used to replace the human eye as the sensing element.
Industry:Weather
In climatology, the vectorial average of all wind directions and speeds for a given level at a given place for a certain period, such as a month. It is obtained by resolving each wind observation into components from south and west, summing over the given period, obtaining the averages, and reconverting the average components into a single vector. Compare Lambert's formula, wind rose, prevailing wind direction.
Industry:Weather
In climate modeling studies, the tendency for simulated temperature changes to be larger at high latitudes, as in the case of the warming induced by increased greenhouse gases.
Industry:Weather
In British climatology, a relative drought period of at least 29 consecutive days during which the average daily rainfall does not exceed 0. 01 in. Compare absolute drought.
Industry:Weather
In aviation weather, the occurrence or expected occurrence of specified en route weather phenomena that may affect the operation of aircraft.
Industry:Weather
In aviation terminology, the cloudless air between the “towers” of two cumulus congestus or cumulonimbus clouds and above a lower cloud mass.
Industry:Weather
In astronomy, the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle (celestial meridian) of the celestial body in question. Right ascension and declination are the two principal coordinates used in positional astronomy.
Industry:Weather
