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- W2052765753 abstract "A catastrophic rain event occurred in early June 2002 during a major drought over the Canadian Prairies. The storm brought record-breaking rainfall and major flooding to many locations in the region. Given the importance of this event, this study's overall objectives are to characterize and to understand the physical nature of the rainstorm better. The event was associated with a major extratropical cyclone which acted in concert with the Great Plains low-level jet to transport a tremendous amount of moisture into the eastern Prairies producing intense diurnal mesoscale convective systems over the region. At the same time, moisture was transported to the western Prairies by a strong easterly low-level jet which produced heavy and long-lived orographic precipitation near the foothills. Several working hypotheses were developed to explain the severity and longevity of the rainstorm; it was found that the Rockies played a central role in the organization and development of the system. Atmospheric features that are critical to the development of an important class of extreme rain events in the Canadian Prairies were also identified. The severity of the June 2002 system is partly a result of the rare co-occurrence of these features during the period. Results from a preliminary analysis show that the atmospheric conditions associated with the extreme background drought enhanced the likelihood of the co-occurrence of these features during spring 2002, hence facilitating the development of the extreme rain event. In return, the tremendous precipitation from the storm alleviated the drought conditions in the southern Prairies. R ésumé [Traduit par la rédaction] Un événement de pluie catastrophique s'est produit au début de juin 2002 pendant une sécheresse importante dans les Prairies canadiennes. La tempête a produit des chutes de pluie records et des inondations importantes à plusieurs endroits dans la région. Étant donné l'importance de cet événement, les objectifs généraux de la présente étude sont de mieux caractériser et de mieux comprendre la nature physique de la tempête de pluie. L'événement a été causé par une importante dépression extratropicale qui s'est associée au courant-jet à basse altitude des Grandes Plaines pour transporter une énorme quantité d'humidité dans l'est des Prairies et produire d'intenses systèmes convectifs de mésoéchelle diurne dans la région. En même temps, de l'humidité transportée dans l'ouest des Prairies par un fort courant-jet à basse altitude soufflant de l'est a produit d'intenses précipitations orographiques persistantes près des contreforts. Nous avons formulé plusieurs hypothèses de travail pour expliquer l'intensité et la persistance de la tempête de pluie; il ressort que les Rocheuses ont joué un rôle central dans l'organisation et le développement du système. Nous avons aussi identifié les caractéristiques atmosphériques essentielles à la formation d'une catégorie importante d'événements de pluie extrêmes dans les Prairies canadiennes. L'intensité du système de juin 2002 est en partie le résultat de la rare présence simultanée de ces caractéristiques durant la période. Les résultats d'une analyse préliminaire montrent que les conditions atmosphériques liées à la sécheresse extrême qui régnait en toile de fond ont augmenté la probabilité d'une présence simultanée de ces caractéristiques au cours du printemps 2002, ce qui a favorisé la formation de l'événement de pluie extrême. En revanche, les précipitations diluviennes produites par la tempête ont atténué les conditions de sécheresse dans le sud des Prairies." @default.
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- W2052765753 date "2011-12-01" @default.
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- W2052765753 title "The Catastrophic June 2002 Prairie Rainstorm" @default.
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- W2052765753 doi "https://doi.org/10.1080/07055900.2011.623079" @default.
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