The low pressure system is currently sweeping across South Australia, bringing widespread rain to the state, before it moves east towards Victoria and New South Wales.
Once the weather system reaches Queensland tomorrow, it is expected to combine with a low pressure trough and inundate about 90 percent of the state.
The Bureau of Meteorology has issued a flood watch in Queensland from Cairns to Gladstone, which includes Mackay, Townsville and Rockhampton.
The rain is expected to begin today on the tropical north coast and will spread to wider areas tomorrow and Friday.
In South Australia, today is expected to be the wettest day, although Mr Dutschke said the state will avoid any significant rainfall.
Victoria will cop the worst of the weather system on Friday, with heavy drenchings expected in the north of the state.
In NSW, the hardest hit areas will be in the west where up to 20mm of rain will fall between Friday and Saturday.
