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The June 2013 Alberta Catastrophic Flooding Event: Part 1—Climatological aspects and hydrometeorological features

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Type de ressource
Article de revue
Auteurs/contributeurs
  • Liu, A. Q. (Auteur)
  • Mooney, C. (Auteur)
  • Szeto, K. (Auteur)
  • Thériault, J. M. (Auteur)
  • Kochtubajda, B. (Auteur)
  • Stewart, R. E. (Auteur)
  • Boodoo, S. (Auteur)
  • Goodson, R. (Auteur)
  • Li, Y. (Auteur)
  • Pomeroy, J. (Auteur)
Titre
The June 2013 Alberta Catastrophic Flooding Event: Part 1—Climatological aspects and hydrometeorological features
Résumé
Abstract In June 2013, excessive rainfall associated with an intense weather system triggered severe flooding in southern Alberta, which became the costliest natural disaster in Canadian history. This article provides an overview of the climatological aspects and large‐scale hydrometeorological features associated with the flooding event based upon information from a variety of sources, including satellite data, upper air soundings, surface observations and operational model analyses. The results show that multiple factors combined to create this unusually severe event. The event was characterized by a slow‐moving upper level low pressure system west of Alberta, blocked by an upper level ridge, while an associated well‐organized surface low pressure system kept southern Alberta, especially the eastern slopes of the Rocky Mountains, in continuous precipitation for up to two days. Results from air parcel trajectory analysis show that a significant amount of the moisture originated from the central Great Plains, transported into Alberta by a southeasterly low level jet. The event was first dominated by significant thunderstorm activity, and then evolved into continuous precipitation supported by the synoptic‐scale low pressure system. Both the thunderstorm activity and upslope winds associated with the low pressure system produced large rainfall amounts. A comparison with previous similar events occurring in the same region suggests that the synoptic‐scale features associated with the 2013 rainfall event were not particularly intense; however, its storm environment was the most convectively unstable. The system also exhibited a relatively high freezing level, which resulted in rain, rather than snow, mainly falling over the still snow‐covered mountainous areas. Melting associated with this rain‐on‐snow scenario likely contributed to downstream flooding. Furthermore, above‐normal snowfall in the preceding spring helped to maintain snow in the high‐elevation areas, which facilitated the rain‐on‐snow event. Copyright © 2016 John Wiley & Sons, Ltd.
Publication
Hydrological Processes
Volume
30
Numéro
26
Pages
4899-4916
Date
2016-12-30
Abrév. de revue
Hydrological Processes
Langue
en
DOI
10.1002/hyp.10906
ISSN
0885-6087, 1099-1085
Titre abrégé
The June 2013 Alberta Catastrophic Flooding Event
URL
https://onlinelibrary.wiley.com/doi/10.1002/hyp.10906
Consulté le
06/11/2024 16:01
Catalogue de bibl.
DOI.org (Crossref)
Autorisations
http://onlinelibrary.wiley.com/termsAndConditions#vor
Référence
Liu, A. Q., Mooney, C., Szeto, K., Thériault, J. M., Kochtubajda, B., Stewart, R. E., Boodoo, S., Goodson, R., Li, Y., & Pomeroy, J. (2016). The June 2013 Alberta Catastrophic Flooding Event: Part 1—Climatological aspects and hydrometeorological features. Hydrological Processes, 30(26), 4899–4916. https://doi.org/10.1002/hyp.10906
Auteur·e·s
  • Thériault, Julie M.
Lien vers cette notice
https://bibliographies.uqam.ca/escer/bibliographie/PSED54AQ
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