A case of an undular bore and prefrontal precipitation in the Australian Alps
Campbell D Watson, Todd P Lane
Monthly Weather Review | AMER METEOROLOGICAL SOC | Published : 2016
This study explores the mesoscale processes that led to the development of two prefrontal precipitation events in the Australian Alps on 29-30 October 2010. The synoptic setting was characterized by the passage of an interacting front and prefrontal trough across southern Australia. Observations and model simulations revealed that when the prefrontal trough entered southeast Australia it resembled a density current advancing into a stable nocturnal layer, forming a bore at its leading edge. The bore detached from and propagated ahead of the prefrontal trough and became undular, supported by a wave-ducting mechanism. The undular bore was observed in the Doppler wind field of a radar, parts of..View full abstract
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Campbell D. Watson was supported by a Melbourne Research Scholarship. Computing was performed at the National Computational Infrastructure (NCI) Facility. The work benefitted from computational support provided by the ARC Centre of Excellence for Climate System Science (CE110001028). We thank Alan Seed for providing the radar-derived rainfall fields from the Yarrawonga radar. Thanks also to Daniel Kirshbaum and three anonymous reviewers for their constructive feedback on an earlier version of this manuscript.