The flooding on the mid-north coast is the worst since 1929, according to the emergency services minister, David Elliot. Show Hide Experts say it’s unusual to see so many places with such high rainfall across such a wide area. Here, you can see the flooding and rainfall in context with historical data (or at least as much as is available), with some areas breaking longstanding records for river heights. Here’s the view of rainfall in the same format, which is good for showing days with extreme rainfall against historical extremes. However with flooding, the issue is not necessarily a single heavy day of rain, but sustained heavy rainfall over time.

Source: The Guardian March 23, 2021 01:07 UTC