The Australian 24-hour rainfall record of 907mm is still Crohamhurst in the Brisbane catchment recorded on 3 February, 1893. The recent torrential rains in South East Queensland are not unprecedented. In it I also mention the possible volcano connection to extremely wet year. This contradicts the media headlines that come without any data.Īnd because I haven’t already, I’ll drop the text from an article I had published in The Spectator, that also got me the cover for the magazine that week. Like for everywhere else, there is no increase in the frequency of these extremely wet days, or the volume of rain falling. Wettest 1% of days in Brisbane (measured as 99th percentile) charted for each year from 1887 to 2021 by number of days and also volume of rain falling. Since Sam visited, Chris Gillham has sent me some more charts, including charts showing the frequency of extremely wet days in Brisbane and the how wet they were on a year-by-year basis beginning in 1887. In the video that Sam made, I talk about the year 1816 that is known as the year without a summer because of incessant rain in England from the explosion of Mount Tambura in Indonesia the previous April. There is a wonderful chapter in ‘Climate Change: The Facts 2020’ entitled ‘Cosmoclimatology’ that explains the link between an atmosphere high in aerosols and wetter climates over the millennia. I explain how volcanic aerosols can supercharge the atmosphere, acting as condensation nuclei.
Then Sam McClelland visited Noosa and filmed me talking about the information in that blog post, and especially its charts, including me hypothesising that the high – but not unprecedented – rainfall totals could be a consequence of the eruption of the Tongan volcanoe – Hunga Tonga-Hunga Ha’apai. I incorporated this information into a recent blog post focused on Lismore. My friend Chris Gillham ( ) downloaded data from the Australian Bureau of Meteorology and charted it for locations in northern New South Wales to see if the number of extremely wet days or their frequency was increasing. But these claims are disproven when the data is actually analysed. The impression is that the volume of rain falling over any one 24-hour period has been increasing, along with the number of extremely wet days. Missing from the news stories about recent ‘unprecedented’ rainfall along the East Coast of Australia is any assessment of the actual rainfall data.
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