TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 DEF

Tornado that occurs with a parent cloud in its growth stage and with its vorticity originating in the boundary layer.  3, fiche 1, Anglais, - non%2Dsupercell%20tornado

Record number: 1, Textual support number: 1 CONT

The term "non-supercell tornado" (NST) as given by Wakimoto and Wilson (1989) or "non-mesocyclone tornado" as given by Brady and Szoke (1989) has been used to describe tornadoes associated with storms not displaying the strong pre-tornadic mid-level rotation found in supercell storms. NST's are usually associated with deep convection found along lower tropospheric boundaries possessing significant across-front horizontal shear.  2, fiche 1, Anglais, - non%2Dsupercell%20tornado

Record number: 1, Textual support number: 2 CONT

Non-supercell tornadoes ... [are] tornadoes which are not associated with supercells ... Non-supercell tornadoes present a significant threat to the public, as well as a formidable task for those who must attempt to forecast conditions ripe for their occurrence, and detect their presence once they form.  4, fiche 1, Anglais, - non%2Dsupercell%20tornado

Record number: 1, Textual support number: 3 CONT

Non-supercell tornadoes ... occur in nonmesocyclone convection in an environment of weak shear over a boundary that is a source of vertical vorticity ... The tornado occurs in the development phase of the thunderstorm with the updraft of the thunderstorm stretching the environmental vertical vorticity.  5, fiche 1, Anglais, - non%2Dsupercell%20tornado

Record number: 1, Textual support number: 4 CONT

... we will briefly discuss two types of non-supercell tornadoes ... Gustnadoes [and] Landspouts ...  4, fiche 1, Anglais, - non%2Dsupercell%20tornado

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 CONT

[...] les tornades non-supercellulaires pour la plupart de faible intensité [...] sont parfois déclenchées le long des lignes de grains et sont beaucoup plus difficiles à prévoir du fait qu'elles dépendent de facteurs de vents très locaux. Leur genèse dépend plutôt de mécanismes de basses altitudes.  2, fiche 1, Français, - tornade%20non%2Dsupercellulaire

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 DEF

A rotating thunderstorm updraft that may give rise to a tornado. Scientific American, April 1984.  1, fiche 2, Anglais, - mesocyclone

Record number: 2, Textual support number: 1 CONT

The Doppler radars at King City and Carvel have gust front and microburst (applies only to the immediate 40 km from the radar) algorithms, in addition to the mesocyclone algorithm, which are helpful for real time diagnosis of radial velocity imagery.  2, fiche 2, Anglais, - mesocyclone

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 DEF

circulation cyclonique [...] à l'échelle d'un orage.  1, fiche 2, Français, - m%C3%A9socyclone

Record number: 2, Textual support number: 1 CONT

Les valeurs de vorticité cyclonique et anticyclonique atteignent leurs maximums en moyenne ou haute troposphère, au niveau de plus forte vitesse verticale où la convergence s'annule. Le poids des précipitations formées à partir des gouttelettes de nuage diminue bientôt l'intensité des mouvements verticaux au centre du courant ascendant, il va alors se séparer en deux parties : celle située sur la droite par rapport au déplacement emporte une circulation cyclonique appelée mésocyclone, celle sur la gauche une circulation anticyclonique, le mésoanticyclone.  1, fiche 2, Français, - m%C3%A9socyclone

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

Small, shallow depression which forms mainly in winter over some high-latitude seas within a polar or arctic air mass.  5, fiche 3, Anglais, - polar%20low

Record number: 3, Textual support number: 1 CONT

When arctic-origin air in winter flows southward (northward in the southern hemisphere) across (relatively) warmer seas, strong surface heating acts both to enhance the degree of instability, and trigger vigorous moist convective towers. This is sufficient alone to give rise to heavy, wintry showers/cumulonimbus clusters etc., but often marked troughing, or even a closed circulation in the isobaric flow is found; the resultant low-level convergence/positive vorticity enhancement, plus the localised concentration of the latent heat energy released, enhances development within the system, and an intense (but synoptically small) area of rain, hail, sleet or snow & squally winds can result - a polar low (or polar depression or polar meso-cyclone in some texts).  2, fiche 3, Anglais, - polar%20low

Record number: 3, Textual support number: 2 CONT

What is a polar low? Part of a diverse group of mesoscale weather systems (polar meso-cyclones). ... [There is] three types of polar meso-cyclones: -jet streak type, -arctic front type, -cold low type.  6, fiche 3, Anglais, - polar%20low

Record number: 3, Textual support number: 1 OBS

Polar mesocyclones: a term now used to encompass the whole 'family' of disturbances resulting from arctic air flowing equatorward over progressively warmer seas; the term 'polar low' is now often used only for 'extreme' systems where gale or near gale-force winds are observed.  7, fiche 3, Anglais, - polar%20low

Record number: 3, Textual support number: 2 OBS

Its motion is approximately the same as the air stream in which it is embedded.  5, fiche 3, Anglais, - polar%20low

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 DEF

Petite dépression peu profonde qui se forme principalement en hiver dans une masse d'air polaire ou arctique située sur certaines mers des hautes latitudes.  1, fiche 3, Français, - d%C3%A9pression%20polaire

Record number: 3, Textual support number: 1 OBS

Son mouvement est approximativement le même que celui du courant atmosphérique dans lequel elle se situe.  1, fiche 3, Français, - d%C3%A9pression%20polaire

Fiche 3,  Justifications,  Espagnol

Record number: 3, Textual support number: 1 DEF

Depresión pequeña y poco profunda que se forma dentro de una masa de aire polar o ártico, especialmente en invierno, sobre los mares polares.  1, fiche 3, Espagnol, - baja%20polar

Record number: 3, Textual support number: 1 OBS

Se mueve siguiendo, aproximadamente, la dirección de la corriente de aire en que está inserta.  1, fiche 3, Espagnol, - baja%20polar