TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

DOWN SLOPE WIND [6 records]

Record 1 2023-01-24

English

Subject field(s)
  • Atmospheric Physics
  • Climatology
  • Ecosystems
CONT

Mountainous terrain is well known for the creation of local "frost hollows" due to cold air drainage. The significant temperature anomalies experienced in such regions can have strong impacts on local native plant distributions, as well as horticulture and agriculture... The flowing cold air drains gravitationally down slope..., often at variance to the prevailing synoptic flow above..., although the drainage will be enhanced if it lies in the same direction as the prevailing wind...

French

Domaine(s)
  • Physique de l'atmosphère
  • Climatologie
  • Écosystèmes

Spanish

Save record 1

Record 2 2020-11-19

English

Subject field(s)
  • Atmospheric Physics
DEF

A thermally driven wind directed down a mountain slope and usually occurring at night; part of the along-slope wind system.

Key term(s)
  • down-slope flow
  • down-slope airflow

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 2

Record 3 2017-11-23

English

Subject field(s)
  • Skydiving, Paragliding and Hang Gliding
CONT

Paragliders have no rigid structure and are kept in shape by the internal pressure of air, with the pilot suspended by lines beneath. The pilot is clipped into a harness and oriented in a sitting position for maximum comfort. After laying out the wing and lines, launching is simply a matter of moving down the slope a few steps to tension the lines and allow the wind to inflate the wing and raise it above you. A short run forward to pick up airspeed and you’re airborne!

CONT

Paraglider pilots launch from gentle hillsides with their gliders already opened for flight; if the glider isn’t flying properly, the launch can be aborted before leaving the ground. Paragliding launches are not as "committing"; if you want to stop your launch, you just stop running and the canopy floats down behind you. The pilot runs down a gentle slope and glides away from the mountain.

CONT

The take-off, contrary to popular belief, does not involve a leap off a cliff, all you have to do is run a few steps to be airborne.

Key term(s)
  • take off
  • takeoff

French

Domaine(s)
  • Parachutisme, parapente et deltaplane
CONT

Le décollage s'effectue en général dans une pente. Le parapentiste place son aile à terre, bien étalée (en forme de corolle) et face à la pente. Il s'installe dans sa sellette en veillant bien à respecter les vérifications d'usage (points d'accrochages de la sellette, casque, radio et pas de nœuds dans les suspentes). Il faut qu'il y ait une légère brise qui remonte la pente face à lui pour lui faciliter le décollage et que les conditions météorologiques soient adaptées.

CONT

Le décollage dépend aussi des conditions aérologiques et de la structure du relief choisi. On ne saute pas, on ne se jette pas, on décolle et un décollage est rapide lorsqu'il y a un peu de vent de face, et nécessite un peu plus de temps et de course d'élan lorsque le vent est faible ou nul.

Spanish

Save record 3

Record 4 2008-08-07

English

Subject field(s)
  • Atmospheric Physics
  • Wind Energy
DEF

A wind that accelerates as it moves downslope because of its low temperature and greater density.

CONT

A fall wind is a larger-scale phenomenon than the individual-slope scale [wind] and is produced by accumulated cold air spilling down a slope or over a mountain range.

French

Domaine(s)
  • Physique de l'atmosphère
  • Énergie éolienne
DEF

Phénomène de plus grande envergure que le vent de gravité, comme dans le cas d'un mouvement de l'air froid d'un intérieur élevé vers une côte maritime plus chaude.

Spanish

Save record 4

Record 5 2007-06-22

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

The air pressure wave which may precede (or accompany) an avalanche.

CONT

Destruction from avalanches results both from the avalanche wind (the air pushed ahead of the mass) and from the actual impact of the avalanche material.

CONT

[Powder snow] avalanches composed of dry snow usually generate a dust cloud as the sliding snow is whirled into the air... Their speed may exceed 200 km/hr.... Under certain circumstances, enough snow crystals are mixed with the air to form an aerosol which behaves as a sharply bounded body of dense gas rushing down the slope ahead of the sliding snow. This wind blast can inflict heavy destruction well beyond the normal bounds of the avalanche track.

CONT

Some slides, particularly large ones, appear to be preceded by an air blast or pressure wave. Destructive air blasts are not common. However, there are certain paths where the phenomena occurs regularly. When it does occur the air blast may extend about 100 meters beyond a major path.

CONT

Damage to trees from the avalanche was caused by the air blast. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.]

OBS

Sometimes reference is made to a shock wave. This is misleading since the air blast is not a true shock wave.

OBS

The most destructive form [of an avalanche wind is] the avalanche blast. It occurs when an avalanche is stopped abruptly, as in the case of an almost vertical fall into a valley floor.

OBS

air blast; wind blast: terms officially approved by the Avalanche Bulletin Terminology Standardization Committee.

Key term(s)
  • airblast
  • windblast

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Souffle précédant le front de l'avalanche (en général mixte ou en aérosol).

CONT

Une avalanche en aérosol est un écoulement turbulent résultant de la suspension de particules de neige dans l'air, il ressemble à un gros nuage de neige se déplaçant à très grande vitesse. Il est précédé d'environ une centaine de mètres par un écoulement d'air (sans entraînement de cristaux) appelé vent ou souffle de l'avalanche. La pression de ce souffle est faible, de l'ordre de 5 kN/m², mais peut être suffisant pour provoquer des dégâts (arbres, toitures, etc.).

CONT

Le vent d'avalanche a endommagé les arbres. [Exemple entériné par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.]

OBS

vent d'avalanche; souffle de l'avalanche; souffle : termes uniformisés par le Comité d'uniformisation de la terminologie des bulletins d'avalanche.

Spanish

Save record 5

Record 6 2003-06-20

English

Subject field(s)
  • Atmospheric Physics
  • Environmental Studies and Analyses
  • Air Pollution
CONT

Mountain ranges have some very interesting weather patterns. One of these amazing phenomenons is the valley wind. Valley winds originate on south facing slopes in the northern hemisphere, and north-facing slopes in the southern hemisphere. When the face of the mountain and surrounding air is heated, the density of the air decreases. This results in the air rising to the top of the slope. During night, the process is reversed, and the air turns into a down slope wind. These winds can be quite powerful.

CONT

At night air cooled on the mountain slopes flows down into the valley displacing bottom air which rises and completes the cycle. Downslope or katabatic winds are usually moderate in strength.

OBS

downslope winds: bora, gravity wind, katabatic wind, etc.

Key term(s)
  • down-slope wind

French

Domaine(s)
  • Physique de l'atmosphère
  • Études et analyses environnementales
  • Pollution de l'air
CONT

Le vent montant de la vallée ou descendant de la montagne, met [...] à l'épreuve plus d'un joueur.

CONT

Le mistral, il ne faut pas l'oublier; est souvent appelé vent «catabatique», c'est-à-dire vent descendant.

CONT

[...] on distingue plusieurs sortes de vents : vent de mer (sur le littoral), vent de terre, vent ascendant, vent descendant et foehn.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Estudios y análisis del medio ambiente
  • Contaminación del aire
Save record 6

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