Rainband stretching 3000 kilometres heading to outback [Video]

A 3000-kilometre rainband stretching over a large part of the nation could bring more rainfall to outback areas.

Forecasters are warning roads could be cut off at the end of the week, as the clean-up continues from the devastating NSW floods.

The rain is heading for northern Western Australia, the Northern Territory and parts of Queensland.

”While southern Australia is enduring a blast of wintry weather this week, parts of northern and central Australia will cop heavy rain from a big north-west cloud band,” Weatherzone said.

Meanwhile, the nation’s south-east is in for colder temperatures, with the mountains to see snow.

Adelaide has seen its heaviest rain for nine months today, Weatherzone said.

The air quality is classed as “very poor” in the city.