Sydney, Aug. 20 -- Millions of residents of the Australian state of New South Wales (NSW) were on Wednesday told to prepare for possible flooding as a severe wet weather system hits the country's east coast.

Authorities in NSW on Wednesday issued heavy rainfall warnings for communities along almost 1,000 km of the state's coastline, including Sydney.

The Bureau of Meteorology (BoM) said that the significant rain event driven by three separate weather systems was expected to bring isolated rainfall totals of up to 75 millimeters on Wednesday night, followed by up to 120 millimeters on Thursday and another 60 millimeters on Friday.

Speaking at a press conference on Wednesday afternoon, NSW State Emergency Service Deputy Commissioner Deb...