- 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 line of equal change in atmospheric pressure during a specified time interval; an isopleth of pressure tendency. A common form is drawn for the three-hourly local pressure tendencies on a synoptic surface chart. Positive and negative isallobars are sometimes referred to as anallobars and katallobars, respectively.
Industry:Weather
A line drawn through points of equal vertical component of wind velocity. Positive values indicate upward motion, negative values indicate downward motion.
Industry:Weather
A line drawn through geographical points recording equal amounts of precipitation during a given time period or for a particular storm.
Industry:Weather
A line drawn through points of equal humidity on a given surface; an isopleth of humidity. The humidity measures used may be the relative humidity, or the actual moisture content (specific humidity or mixing ratio). See isodrosotherm.
Industry:Weather
A line in some given surface joining all points having the same direction of a particular vector quantity. In meteorology, isogons are usually drawn for the velocity vector as an aid in constructing streamlines for a wind field. Compare isotach.
Industry:Weather
A line in a chart connecting all points having the same time of occurrence of a particular phenomenon or of a particular value of a quantity. In meteorology, for example, the past positions of fronts, instability lines, isotherms, etc. , on a continuity chart constitute an isochrone.
Industry:Weather
A line drawn through geographical points at which the blossoming of a given plant occurs on the same date.
Industry:Weather
A line drawn through geographical points having the same pluvial index. Compare isomer.
Industry:Weather
A line drawn through geographical points at which some phenomenon connected with thunderstorms has the same frequency or intensity. Its most recent specific use is for lines of equal frequency of lightning discharges. See isobront.
Industry:Weather
