Abstract
Abstract On the night of 27–28 August 1985, a cloud band associated with a cold front dramatically broadened over southeastern Australia, leading to unforecast rain and overforecast daytime temperatures. This paper presents a detailed synoptic description of this event, describes the vertical circulations leading to cloud band development, and, by means of back trajectory analysis, determines the origins of air parcels entering the cloud band. The analyses which were used in this diagnostic study were prepared using an intermittent insertion incremental limited-area data assimilation system. The consistency and coherence of the diagnostic quantities calculated from these analyses demonstrates the value of linking the analyses with a dynamic forecast model, even with the relatively coarse resolution of 250 km used in this study. It is shown that, following the reorganization of the jet patterns over Western Australia (WA), pressure falls lead to an amplification of the surface pressure trough and the accel...
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