Anabatic wind

Anabatic wind

An anabatic wind, from the Greek "anabatos", verbal of "anabainein" meaning moving upward, is a wind which blows up a steep slope or mountain side. It is also known as an upslope flow. These winds typically occur during the daytime in calm sunny weather. A hill or mountain top will be radiatively warmed by the Sun which in turn heats the air just above it. Air at a similar altitude over an adjacent valley or plain does not get warmed so much because of the greater distance to the ground below it. The effect may be enhanced if the lower lying ground is shaded by the mountain and so receives less heat.

The air over the hill top is now warmer than the air at a similar altitude around it and will rise through convection. This creates a lower pressure region into which the air at the bottom of the slope flows, causing the wind. It is common for the air rising from the tops of large mountains to reach a height where it cools adiabatically to below its dew point and forms cumulus clouds. These can then produce rain or even thunderstorms.

Anabatic winds are particularly useful to soaring glider pilots who can use them to increase the aircraft's altitude, though detrimental to the maximum downhill speed of cyclists.

Katabatic winds are down-slope winds, frequently produced at night by the opposite effect, the air near to the ground losing heat to it faster than air at a similar altitude over adjacent low-lying land.

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  • anabatic wind — A local wind that flows up the side of the valleys resulting from increased heating along the valley walls. Often anabatic wind results in cumulus clouds along the ridges on either side of the valley. These winds are the opposite of katabatic… …   Aviation dictionary

  • anabatic wind — also called  upslope wind        local air current that blows up a hill or mountain slope facing the Sun. During the day, the Sun heats such a slope (and the air over it) faster than it does the adjacent atmosphere over a valley or a plain at the …   Universalium

  • anabatic wind — noun An upslope wind; usually applied only when the wind is blowing up a hill or mountain as a result of local surface heating and apart from the effects of the larger scale circulation; the opposite of katabatic wind. The most common type… …   Wiktionary

  • anabatic — adjective Etymology: Greek anabatos, verbal of anabainein Date: 1853 moving upward ; rising < an anabatic wind > …   New Collegiate Dictionary

  • anabatic — /an euh bat ik/, adj. Meteorol. 1. pertaining to an uphill wind produced by the effects of local heating. Cf. katabatic. 2. (formerly) pertaining to any upward moving air current. [1805 15; < Gk anabatikós pertaining to climbing or to a climber,… …   Universalium

  • anabatic — adj. (Meteorology) created by the upward flow of warm air (of a wind) …   English contemporary dictionary

  • anabatic — [ˌanə batɪk] adjective Meteorology (of a wind) caused by local upward motion of warm air. Origin early 20th cent.: from Gk anabatikos, from anabatēs a person who ascends …   English new terms dictionary

  • anabatic — an•a•bat•ic [[t]ˌæn əˈbæt ɪk[/t]] adj. mer (of a wind or air current) moving upward Compare katabatic • Etymology: 1805–15; < Gk anabatikós pertaining to climbing =anaba , s. of anabaín(ein) to go up + tikos tic …   From formal English to slang

  • anabatic — Related to wind currents, especially rising winds …   Grandiloquent dictionary

  • anabatic — adj. Meteorol. (of a wind) caused by air flowing upwards (cf. KATABATIC). Etymology: Gk anabatikos ascending (as ANABASIS) …   Useful english dictionary

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