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THUNDERSTORM CONVECTION [4 records]

Record 1 2005-05-12

English

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

Tornado that occurs with a parent cloud in its growth stage and with its vorticity originating in the boundary layer.

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.

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.

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.

CONT

... we will briefly discuss two types of non-supercell tornadoes ... Gustnadoes [and] Landspouts ...

Key term(s)
  • non supercell tornado
  • non mesocyclone tornado
  • nonmesocyclone tornado

French

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

Key term(s)
  • tornade non supercellulaire

Spanish

Save record 1

Record 2 2004-10-29

English

Subject field(s)
  • Atmospheric Physics
DEF

An upward-rushing air current caused by convection and usually found in the front portion of a heavy-to-violent thunderstorm.

OBS

The term "lift" used as a synonym of "updraft" could only be found in bilingual dictionaries and in some cases in reference to flying.

OBS

updraft: term officially approved by the Aeronautical Terminology Standardization Committee (ATSC) - Helicopters.

Key term(s)
  • uplift
  • up-draft

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Courant aérien possédant une composante verticale dirigée de bas en haut.

CONT

Un courant ascendant est un courant transportant de l'air vers le haut dans la direction verticale au sein de l'atmosphère. Cette notion, en fait, est particulièrement dépendante de l'échelle spatio-temporelle à laquelle la vitesse verticale de l'air est évaluée.

OBS

ascendance : terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Hélicoptères.

OBS

courant ascendant; ascendance : termes uniformisés par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Opérations aériennes.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Corriente de aire, de pequeñas dimensiones, que se mueve hacia arriba.

Save record 2

Record 3 2004-09-24

English

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

Thunderstorm resulting from the convection induced by a frontal lifting.

Key term(s)
  • frontal thunder-storm
  • frontal thunder storm

French

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

Orage résultant de la convection produite par une ascendance frontale.

CONT

Les orages se développent, soit au sein de masses d'air riches en vapeur d'eau et fortement réchauffées à la base (orages dits de masse d'air), que l'on observe plus fréquemment pendant le semestre estival, soit dans l'air chaud, le long d'une surface frontale (orages frontaux).

Spanish

Campo(s) temático(s)
  • Fenómenos meteorológicos, climáticos y atmosféricos
DEF

Tormenta resultante de la convección producida por una ascendente frontal.

Save record 3

Record 4 2004-08-20

English

Subject field(s)
  • Atmospheric Physics
CONT

An issue of considerable interest is the so-called multicellular thunderstorm system, as opposed to supercells, which are often presumed to be unicellular. A form of multicellular convection that has already been simulated extensively is the squall line. The typical method for simulating this form of deep line-oriented convection has been to release a number of laterally-aligned IB's. After the initial storms develop, their outflows merge, producing a line of convection resembling a squall line. Squall lines are not the only type of multicellular convection observed, however. In isolated multicell storms, a succession of updrafts is typical.

OBS

Thunderstorms are often classified into a spectrum based on their cell structure: single cells, multicellular storms, and supercells. The type of storm depends on the instability and relative wind conditions at different layers of the atmosphere (shear). The "single-cell" (unicell) thunderstorm is [a] three-stage situation ... usually lasting about 30 minutes from the start of significant precipitation. A severe unicell storm is often referred to as a pulse thunderstorm. ... In a multicell thunderstorm, several thunderstorm cells merge into a larger system. The cloud becomes divided into updraft and downdraft regions separated by a gust front. The gust front may extend for several miles ahead of the storm, bringing with it increases in wind speed and atmospheric pressure, decreases in temperature, and shifts in wind direction. The storm itself will have different portions sequentually going through the various thunderstorm stages. In many cases the immature cells develop along a line known as a "flanking line," resulting in what is known as a line multicell.

OBS

storm system: Often refers to "thunderstorm system" (in French: "système orageux"), which is a frequent type of storm system but not the only one; an elliptic form which can be used when there is no risk of ambiguity.

French

Domaine(s)
  • Physique de l'atmosphère

Spanish

Save record 4

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