Flash flooding on Australia's southeast coast has killed three people and cut off towns, isolating tens of thousands of residents, as officials on Thursday warned more downpours were expected over the next 24 hours.

More than 100 schools are closed on Thursday, while thousands of properties remain without power, authorities said. A slow-moving coastal trough has dumped about four months of rain over the past two days,

Four people have died and whole towns have been left submerged in water after flooding struck New South Wales in Australia. A deluge of rain over the past few days has caused severe flooding along the coast north of Sydney.