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THUNDERSTORM SYSTEM [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-03-07

English

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

A deep convective system which is considerably larger than an individual thunderstorm...

CONT

A particular type of MCS [mesoscale convective system], an MCC is a large, circular, long-lived cluster of showers and thunderstorms identified by satellite. It often emerges out of other storm types during the late-night and early-morning hours. MCCs can cover an entire state.

OBS

The area with a temperature below −52 °C must exceed 50 000 km², and there must be a continuous area, exceeding 100 000 km², below −32 °C. This larger area must be elongated, with an eccentricity (ratio of minor axis to major axis) of 0.7 or more. These criteria must be satisfied for a period of more than 6 hours for the classification to apply.

OBS

... it is often marked by an extensive middle-to-upper tropospheric stratiform-anvil cloud of several hundred kilometres in breadth.

Key term(s)
  • meso-scale convective complex

French

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

Système convectif de grande extension verticale et d'étendue considérablement plus grande qu'une simple cellule orageuse [...]

CONT

Plus spécifiquement, les complexes convectifs de méso-échelle (CCM), un type de SCM [système convectif de méso-échelle] large et persistant, sont associés à des précipitations intenses pouvant causer des inondations, le tout accompagné de vents forts.

OBS

[...] il est souvent associé à un nuage stratiforme en forme d'enclume des niveaux moyens à supérieurs de la troposphère qui peut s'étendre horizontalement sur plusieurs centaines de kilomètres.

Spanish

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

Sistema convectivo profundo apreciablemente mayor que una célula tormentosa simple [...]

OBS

[...] se caracteriza a menudo por la presencia de una nube estratiforme en forma de yunque que va de los niveles medios a los superiores de la troposfera y que puede tener una extensión horizontal de varios centenares de kilómetros.

Save record 1

Record 2 2004-12-10

English

Subject field(s)
  • Titles of Federal Government Programs (Canadian)
  • Meteorological Forecasting, Data Measurement and Analysis
OBS

Environment Canada developed a Severe Thunderstorm Watch/Warning Program across Canada to ensure the safety and well-being of all Canadians. The purpose of this program is to deliver Severe Thunderstorm and Tornado Watch/Warning Bulletins. These bulletins are designed to provide as much advance warning as possible of hazardous thunderstorm activity and tornadoes. In addition to a continuous surveillance system(e. g., satellite or meteorological radar coverage), the Program relies on weather observations provided by volunteer weather watchers.

French

Domaine(s)
  • Titres de programmes fédéraux (Gouvernement canadien)
  • Prévisions météorologiques et mesure et analyse des données

Spanish

Save record 2

Record 3 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 3

Record 4 2004-08-20

English

Subject field(s)
  • Atmospheric Physics
CONT

Slow moving storm systems arrived from the southern Plains during the middle of June and tapped into warm and very moist air in Arkansas. The result was heavy to excessive rain with precipitation concentrated in southern sections of the state.

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.

PHR

Mid-latitude, major, multi-celled, slow-moving storm system.

French

Domaine(s)
  • Physique de l'atmosphère
CONT

[...] plusieurs cellules de grêle peuvent se réunir en un système de tempêtes qui s'étend sur toute la Suisse et produit de nombreuses averses de grêle.

CONT

L'importante activité des tempêtes de poussières saisonnières apparaît sur cette image. Un vaste système de tempêtes est en activité très haut dessus de la calotte polaire nord [haut de l'image], et un nuage de poussières plus petit peut être vu à côté.

CONT

Le système de tempête neptunien, situé dans l'hémisphère sud de la planète, porte le nom de grande tache sombre.

CONT

La grande Tache Rouge de Jupiter semble être un système de tempête de type ouragan géant tournant avec les nuages Joviens.

CONT

Système de tempête hivernale montrant le centre dépressionnaire (« L »), les fronts froid et chaud, ainsi que les conditions météorologiques associées.

OBS

On trouve aussi, parfois, système orageux, mais c'est un spécifique qui correspond à «thunderstorm system».

Spanish

Save record 4

Record 5 2004-05-13

English

Subject field(s)
  • Atmospheric Physics
DEF

The final phase in the life cycle of a thunderstorm cell; features downdrafts throughout the system and vaporization of clouds.

CONT

The life cycle of a thunderstorm cell can be divided into three stages which are determined by the magnitude and direction of the predominating vertical motions within the cell. These stages include (1) the cumulus stage, (2) the mature stage, and (3) the dissipation stage. ... The dissipating stage is characterized by weak downdrafts throughout the cell. In this stage there are no longer the updraft currents which provided the condensing water (precipitation) in the previous stage. When complete dissipation has occurred, only stratified clouds will remain.

French

Domaine(s)
  • Physique de l'atmosphère
CONT

Le stade de dissipation [est] caractérisé par des mouvements descendants. [...] Le stade de dissipation commence dès que les courants ascendants disparaissent et que les courants descendants ont envahi l'ensemble de la cellule. Le nuage commence à se dissiper. La dissipation totale ou la stratification intervient dès que la pluie (ou la neige) et les courants descendants cessent. Le sommet du nuage prend la forme caractéristique d'une enclume (cb incus) qui peut s'étendre horizontalement sur plusieurs kilomètres. Dès le début de ce stade, qui dure environ 30 minutes, les risques d'orage disparaissent. Lorsque les mouvements descendants cessent, les températures à l'intérieur de la cellule deviennent égales à celles de l'air environnant à même altitude.

OBS

Un orage est composé de différentes cellules qui se trouvent à un stade de développement différent. Le cycle de vie d'une des cellules comporte trois stades : cumulus (ou naissance), adulte et dissipation.

Spanish

Save record 5

Record 6 2004-05-13

English

Subject field(s)
  • Atmospheric Physics
DEF

Initial stage in the life cycle of a thunderstorm cell; consists of towering cumulus clouds with updraft throughout the system.

CONT

The life cycle of a thunderstorm cell can be divided into three stages which are determined by the magnitude and direction of the predominating vertical motions within the cell. These stages include (1) the cumulus stage, (2) the mature stage, and (3) the dissipation stage. ... In the cumulus stage a cell is formed from a collection of cumulus clouds, characterized by updrafts throughout the cell. The in-cloud temperatures in a strongly developing cell are higher than the temperatures of the surrounding environment at corresponding altitudes.

French

Domaine(s)
  • Physique de l'atmosphère
CONT

Stade cumulus. Durant ce stade, la cellule est caractérisée par des mouvements ascendants à travers toute la cellule. [...] Ces mouvements ascendants maintiennent en suspension l'eau liquide formée, empêchant les précipitations en surface. Aucun éclair n'est observé durant ce stade dont la durée est de dix à quinze minutes. Les températures à l'intérieur d'une cellule bien développée sont plus élevées que celles de l'air environnant aux altitudes correspondantes.

OBS

Un orage est composé de différentes cellules qui se trouvent à un stade de développement différent. Le cycle de vie d'une des cellules comporte trois stades : cumulus (ou naissance), adulte et dissipation.

Spanish

Save record 6

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