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convectively unstable air [1 record]

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Alphabetical list of terms

Record 1 2005-04-08

English

Subject field(s)
  • Atmospheric Physics
CONT

Hurricane spiral bands consist of individual convective cells associated with small-scale cumulus convection. The thunderstorms within the spiral bands are organized into regions of rising and sinking air. In contrast to the motion of the band, which moves considerably slower than the mean wind speed, the individual cells tend to move with the mean wind in the layer in which they are embedded. These convective cells, which have typical lifetimes of 20-40 min, are a result of a general lifting within the band of convectively unstable air.

OBS

unstable air: Air in which static instability prevails. This condition is determined by the vertical gradients of air temperature and humidity.

OBS

convection: Organized motions within a layer of air leading to the vertical transport of heat, momentum, etc.

French

Domaine(s)
  • Physique de l'atmosphère
CONT

Les cumulus peuvent [...] grossir suffisamment pour qu'il y ait des averses de pluie, ou même évoluer en cumulonimbus avec orage. On peut rencontrer cette situation : soit dans de l'air chaud convectivement instable sur une grande épaisseur, soit à l'arrière d'un front froid, lorsque à cause d'un flux cyclonique il n'y a pas la moindre subsidence en altitude.

OBS

Des nuages instables peuvent être noyés dans ces nuages moyens lorsque l'air chaud est convectivement instable.

OBS

air instable : Air dans lequel prédomine l'instabilité hydrostatique. Cette situation est déterminée par les gradients verticaux de température et d'humidité de l'air.

OBS

convection : Mouvements organisés dans une couche d'air entraînant des transferts verticaux de chaleur, de quantité de mouvement, etc.

Spanish

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