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front
- Definição1
- (1) The interface or transition zone between air masses of different densities (temperature, humidity). (2) Line of intersection of the surface separating two air masses with another surface or with the ground.
- Fonte1
- WORLD METEOROLOGICAL ORGANIZATION. International Meteorological vocabulary. 2nd ed. Geneva, 1992. (WMO, n.182). Disponível em: < https://library.wmo.int/index.php?lvl=notice_display&id=220#.XeauGOhKiUk >. Acesso em: 21 set. 2021.
- Definição2
- Generally, the interface or transition zone between two air masses of different density. Since the temperature distribution is the most important regulator of atmospheric density, a front almost invariably separates air masses of different temperature. Along with the basic density criterion and the common temperature criterion, many other features may distinguish a front, such as a pressure trough, a change in wind direction, a moisture discontinuity, and certain characteristic cloud and precipitation forms.
- Fonte2
- AMERICAN METEOROLOGICAL SOCIETY. Glossary of meteorology. [S.l., última modificação 05 oct. 2015]. Disponível em: < http://glossary.ametsoc.org/wiki/Main_Page >. Acesso em: 21 set. 2021.
- Definição3
- A boundary or transition zone between two air masses of different density, and thus (usually) of different temperature.
- Fonte3
- UNITED STATES. National Weather Service. National weather service glossary. [20-?]. In: ______. [Homepage]. [Silver Spring, MD, 20-?]. Disponível em: < https://forecast.weather.gov/glossary.php >. Acesso em: 21 set. 2021.
- Fonte4
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Aircraft accident digest n.25. Montreal, 1983. (Cir. 172 AN/108).
- Nota adicional1
- A moving front is named according to the advancing air mass, e.g., cold front if colder air is advancing. Types of front include polar front, arctic front, cold front, warm front, and occluded front.
- Contexto
- Airplane or ground radars may show the gust front as a thin line echo caused by differences between the high air density behind the front and the relatively low air density ahead of it.
- Subárea1
- Meteorology
- Related Term
- climatological front
- meteorologic front
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