2006
DOI: 10.1175/jam2394.1
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The Synoptic Decomposition of Cool-Season Rainfall in the Southeastern Australian Cropping Region

Abstract: Daily rainfall during the April–October growing season in a major cropping region of southeastern Australia has been related to particular types of synoptic weather systems over a period of 33 yr. The analysis reveals that cutoff lows were responsible for at least 50% of all growing-season rainfall and accounted for 80% of daily rainfall events exceeding 25 mm per station. The proportion of rainfall contributed by cutoff lows varies throughout the growing season. It is highest in austral autumn and spring (55%… Show more

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Cited by 119 publications
(197 citation statements)
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“…They are associated with a split of the westerly flow in the upper troposphere into two separate branches ), which favors the detachment of closed low pressure systems from the main westerly flow and equatorward ''steering'' in these branches. This accounts for the initially counterintuitive finding of Pook et al (2006), who report significant positive correlations between days with cutoff rainfall in southeastern Australia and atmospheric blocking in the Australian sector. This role of wintertime atmospheric blocking in southeastern Australia is thus distinct from the more well-known association with summer heat waves in Australia (Hudson et al 2011;Pezza et al 2012) and Europe (e.g., Sillmann and Croci-Maspoli 2009;Coumou and Rahmstorf 2012, and references therein).…”
Section: Introductionmentioning
confidence: 80%
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“…They are associated with a split of the westerly flow in the upper troposphere into two separate branches ), which favors the detachment of closed low pressure systems from the main westerly flow and equatorward ''steering'' in these branches. This accounts for the initially counterintuitive finding of Pook et al (2006), who report significant positive correlations between days with cutoff rainfall in southeastern Australia and atmospheric blocking in the Australian sector. This role of wintertime atmospheric blocking in southeastern Australia is thus distinct from the more well-known association with summer heat waves in Australia (Hudson et al 2011;Pezza et al 2012) and Europe (e.g., Sillmann and Croci-Maspoli 2009;Coumou and Rahmstorf 2012, and references therein).…”
Section: Introductionmentioning
confidence: 80%
“…Significant precipitation events in the SH midlatitudes during the cool season are often associated with cutoff low pressure systems, as demonstrated for southern Australia (Pook et al 2006;Risbey et al 2009;Grose et al 2012), southern South America (e.g., Campatella and Possia 2007), and southern Africa (Singleton and Reason 2007). Such closed lows in the midtroposphere, detached from the westerly flow of the jet stream, occur more frequently around the three midlatitude SH continental landmasses during the cool season (Fuenzalida et al 2005;Reboita et al 2010, and references therein).…”
Section: Introductionmentioning
confidence: 83%
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