Coolgara Creek Cyclone, 7 January 1881:Assessing the historical evidence for a record-breaking event

The study of past tropical cyclones is an area of growing scientific interest despite the methodological challenges associated with utilising descriptive accounts of storms as sources of meteorological and geophysical data. In this article, we investigate a tropical cyclone and storm surge that occurred in the vicinity of Western Australia’s Coolgara and Yamaderry Creeks, east of the present-day town of Onslow, on 7 January 1881. An extensive archive of historical sources is available for this event, including instrumental observations of central pressure as low 26.50 mercury inches (880 hPa) and estimates of a storm surge peaking at 19 feet (~5.8 meters), ranking this event as the earliest confirmed landfalling Category 5 cyclone in Western Australia and among the most intense tropical cyclones and largest storm surges on record in the southern hemisphere. This article evaluates the available documentary evidence to produce an accurate account of what occurred on 7 January 1881. We review the main categories and provenance of extant historical sources, identify and discuss errors in early meteorological and climatological accounts, and recreate plausible scenarios for the cyclone and storm surge, as well as considering novel evidence for a ‘stormquake’ accompanying the cyclone. We also consider why so many eyewitnesses survived the storm, and reflect on the reasons why such a rich archive of historical evidence is available for this exceptional extreme weather event.