TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A mesocyclone is a vortex of air, approximately 2 to 10 miles in diameter, within a convective storm. In a mesocyclone, air rises and rotates around a vertical axis, usually in the same direction as low pressure systems. They are most often associated with a localised low-pressure region within a severe thunderstorm. Such storms can feature strong surface winds and severe hail. Mesocyclones often occur together with updrafts in supercells, where tornadoes may form. Mesocyclones are believed to form when strong changes of wind speed and/or direction with height("wind shear") sets parts of the lower atmosphere spinning in invisible tube-like rolls. The convective updraft of a thunderstorm is then thought to draw up this spinning air, tilting the rolls’ orientation upward(from parallel to the ground to perpendicular) and causing the entire updraft to rotate as a vertical column.  2, record 1, English, - mesocyclone

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Une tornade se forme dans un méga orage, ceux qu'on appelle supercellulaires. Alors qu'un nuage d'orage se crée, si des vents de différentes vitesses (soit des vents rapides en altitude et des vents plus lents au niveau du sol; on appelle cette division le cisaillement des vents) le traversent, une rotation horizontale de l'air se crée dans le nuage. Ce tunnel horizontal est ensuite poussé par l'air chaud qui monte du sol. Le rouleau d'air se redresse à l'intérieur de la cellule orageuse pour prendre une position verticale. Cette colonne d'air qui pivote sur elle-même dans le nuage s'appelle un mésocyclone.  2, record 1, French, - m%C3%A9socyclone

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

... a Doppler radar velocity pattern that indicates a region of intense concentrated rotation.  1, record 2, English, - tornadic%20vortex%20signature

Record number: 2, Textual support number: 1 CONT

The tornadic vortex signature(TVS) appears on radar several kilometers above the ground before a tornado touches ground. It has smaller, tighter rotation than a mesocyclone. While the existence of a TVS does not guarantee a tornado, it does strongly increase the probability of a tornado occurring.  1, record 2, English, - tornadic%20vortex%20signature

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 OBS

[Une signature tornadique de rotation est] un mésocyclone intense détecté par un algorithme qui analyse les données Doppler d'un radar météorologique. Cette signature indique la possibilité de la présence d'une tornade sous l'orage associé.  3, record 2, French, - signature%20tornadique%20de%20rotation

Record number: 2, Textual support number: 2 OBS

STR : L'abréviation TVS fait référence au terme anglais; il vaudrait mieux adopter une abréviation qui correspond au terme français, soit STR pour «signature tornadique de rotation».  2, record 2, French, - signature%20tornadique%20de%20rotation

Record number: 2, Textual support number: 3 OBS

TVS : Certains auteurs utilisent l'abréviation TVS au masculin. Elle doit toutefois être utilisée au féminin puisqu'elle fait référence à la signature tornadique de rotation.  2, record 2, French, - signature%20tornadique%20de%20rotation

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

A supercell with "text-book" like features such as a well-defined hook echo on a radar scope and the precipitation core downwind of the wall cloud and rain free storm base.  2, record 3, English, - classic%20supercell

Record number: 3, Textual support number: 1 CONT

Supercell [is] a thunderstorm with a persistent rotating updraft. Supercells are rare, but are responsible for a remarkably high percentage of severe weather events-especially tornadoes, extremely large hail and damaging straight-line winds. They frequently travel to the right of the main environmental winds(i. e., they are right movers). Radar characteristics often(but not always) include a hook or pendant, bounded weak echo region(BWER), V-notch, mesocyclone, and sometimes a TVS [Tornado Vortex Signature]. Visual characteristics often include a rain-free base(with or without a wall cloud), tail cloud, flanking line, overshooting top, and back-sheared anvil, all of which normally are observed in or near the right rear or southwest part of the storm. Storms exhibiting these characteristics often are called classic supercells; however HP(High Precipitation) storms and LP(Low Precipitation) storms also are supercell varieties.  3, record 3, English, - classic%20supercell

Record number: 3, Textual support number: 2 CONT

The severe version of a worst-last storm is also a supercell type, and is either called a "classic supercell" (the standard supercell type) or an "LP (low-precipitation) supercell" - a dry-weather, high wind shear version. ... The classic supercell has a larger, darker appearance and accounts for most of the major tornado events everywhere.  4, record 3, English, - classic%20supercell

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

Les orages de queue qui sont violents sont aussi de type supercellulaire; on les appelle des orages supercellulaires classiques ou à faibles précipitations (caractérisés par la présence d'air sec et d'un fort cisaillement du vent). [...] Les orages supercellulaires classiques sont de plus grande étendue et plus sombres; ce sont eux qui produisent la plupart des tornades, quelle que soit la région.  1, record 3, French, - orage%20supercellulaire%20classique

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A supercell thunderstorm in which heavy precipitation(often including hail) falls on the trailing side of the mesocyclone.  2, record 4, English, - high%2Dprecipitation%20storm

Record number: 4, Textual support number: 1 CONT

High precipitation supercells ... have a large precipitation core with heavy rains and possible hail. The rain can completely wrap an HP supercell tornado and obscure it from view on any side of the storm. Sometimes called HP’er.  5, record 4, English, - high%2Dprecipitation%20storm

Record number: 4, Textual support number: 1 OBS

Precipitation often totally envelops the region of rotation, making visual identification of any embedded tornadoes difficult and very dangerous. Unlike most classic supercells, the region of rotation in many HP storms develops in the front-flank region of the storm (i.e.,usually in the eastern portion). HP storms often produce extreme and prolonged downburst events, serious flash flooding, and very large damaging hail events.  2, record 4, English, - high%2Dprecipitation%20storm

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 CONT

Les orages supercellulaires à fortes précipitations sont observés le plus souvent dans le centre et le sud-est des États-Unis. On en voit à l'occasion en Ontario et au Québec, mais rarement dans l'ouest du Canada.  1, record 4, French, - orage%20supercellulaire%20%C3%A0%20fortes%20pr%C3%A9cipitations

Record number: 4, Textual support number: 2 CONT

Orage supercellulaire (HP-haute précipitation). Un orage supercellulaire est un orage qui a une très forte précipitation (pluie et grêle) et qui inclut aussi un mésocyclone. La forte précipitation enveloppe et cache le mésocyclone (et possiblement une tornade) ce qui fait son identification difficile. Les orages supercellulaires produisent aussi des vents descendants très forts. Les fortes précipitations peuvent causer des inondation soudaines et peuvent aussi produire de la très grosse grêle.  2, record 4, French, - orage%20supercellulaire%20%C3%A0%20fortes%20pr%C3%A9cipitations

Record number: 4, Textual support number: 3 CONT

orage supercellulaire à haute précipitation : l'on dit plutôt orage supercellulaire à fortes précipitations.  3, record 4, French, - orage%20supercellulaire%20%C3%A0%20fortes%20pr%C3%A9cipitations

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

A small, weak tornado, which is not formed by a storm-scale rotation.  2, record 5, English, - landspout

Record number: 5, Textual support number: 1 CONT

The landspout is a weak tornado type seen under small storms or large, growing cumulus clouds. It is like a cold-air funnel that has touched down, and can cause brief, minor damage. Landspouts occur in most parts of Canada. They don’t always have a full condensation funnel and are sometimes only made visible by the dust they stir up.  3, record 5, English, - landspout

Record number: 5, Textual support number: 1 OBS

landspout... is generally weaker than a supercell tornado and is not associated with a wall cloud or mesocyclone. It may be observed beneath cumulonimbus or towering cumulus clouds and is the land equivalent of a waterspout.  2, record 5, English, - landspout

Record number: 5, Textual support number: 2 OBS

In the sources consulted, some authors consider "landspout" as a slang.  4, record 5, English, - landspout

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

Les trombes terrestres sont des tornades de faible intensité qui se manifestent au-dessous de petits orages ou de gros Cumulus en expansion. Ils ressemblent à des entonnoirs d'air froid qui touchent la surface; ils peuvent causer de légers dommages pendant un court laps de temps. On voit des trombes terrestres dans la plupart des régions du Canada. Ces phénomènes ne comportent pas toujours un entonnoir de condensation entièrement formé et, parfois, seule la poussière qu'ils soulèvent révèle leur présence.  2, record 5, French, - trombe%20terrestre

Record 5,  Textual support,  Spanish