New Study: Pre-1900 Rainfall Events In Sydney, Melbourne “More Extreme” Than Modern Times

The global warming crazies keep insisting that weather has become more extreme, but whenever a study looks at the past weather, it finds the opposite to be true.

The latest is a new study titled “Historical extreme rainfall events in southeastern Australia” authored by Ashcroft et al appearing in the journal Weather and Climate Extremes.

It finds no trend in NSW Australia extreme rainfall events, and oceanic cycles play a major role in the longer term, decadal scale variability.

Hat-tip: Reader Mary Brown

Looking back 178 years

The new paper describes rainfall in three of Australia’s largest cities for the last 178 years using several mean and extreme rainfall indices.

The paper also found several extreme daily rainfall events in the pre-1900 period in Sydney and Melbourne which “appear to be more extreme than anything in the modern record”.

Abstract

The cities of Melbourne, Sydney and Adelaide are home to almost half of the Australian population, and are often exposed to extreme rainfall events and high year-to-year rainfall variability. However the majority of studies into rainfall in these cities, and southeastern Australia in general, are limited to the 20th century due to data availability. In this study we use rainfall data from a range of sources to examine four rainfall indices for Melbourne, Sydney and Adelaide for 1839–2017. We derive the total rainfall, number of raindays, wettest day of the month and the simple daily intensity index for each city over the past 178 years, and find relatively consistent relationships between all indices despite potential data quality issues associated with the historical data. We identify several extreme daily rainfall events in the pre-1900 period in Sydney and Melbourne that warrant further examination as they appear to be more extreme than anything in the modern record. We find a moderate and relatively stable relationship between El Niño–Southern Oscillation (ENSO) and annual variations of total rainfall and the number of raindays at all three cities over the research period, but no relationship between ENSO and the annual wettest day, in agreement with other studies using shorter time series.”

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