Round Three Of Record Rainfall, Flash Flooding Returns To NSW; 5-12" Expected 4/7
Rain has returned to large swathes of New South Wales with multiple flash flooding and severe weather warnings in place over the next three days, as Sydney records five times as much rain as London in the past six months.
Six-hourly rainfall totals could reach 140mm in parts of the NSW south coast on Wednesday afternoon, according to the Bureau of Meteorology. After a brief respite from wet weather, NSW is expected to cop a drenching on Thursday, when six-hourly totals of up to 140mm could fall across metropolitan Sydney, the Blue Mountains, the Central Coast, the south coast and the Illawarra.
Isolated local rains of up to 300mm could fall over the course of Thursday in some areas, however the broader weather warning is that flash flooding can occur with far less rainfall due to the already-soaked soil across much of the state. The severe weather warning for heavy rainfall is in place for people in metropolitan Sydney, the Illawarra and the south coast, as well as parts of the Hunter and central and southern tablelands.
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In the six months to the end of March, Sydney’s Observatory Hill weather station recorded 1,400.6mm of rain; this included the wettest start to a year since records began in 1859, with 554mm record in March alone. Sydney’s drenching has prompted comparisons with a notoriously rainy London. London recorded just 267.2mm in the same six-month period.
EDIT
https://www.theguardian.com/australia-news/2022/apr/06/more-flash-flooding-and-severe-weather-warnings-for-nsw-as-heavy-rain-returns