Severe weather warnings remain in place across South Australia's north with forecasts of intense rain across an area already hit by flooding.
Road and rail links remain cut with towns, including Coober Pedy, isolated and relying on airlifted food and other supplies.
The Bureau of Meteorology says falls in excess of 150 millimetres are possible across the next 24 hours. Locations to feel the brunt of the storms include Marla, Coober Pedy, Moomba, Ernabella, Oodnadatta and Marree.
Ernabella has already recorded more than 100 mm over the past day. On Monday night, Port Augusta was also drenched with more than 50 mm of rain falling in about an hour, causing flooding across the town.
The bureau said a trough extending from Western Australia's north was bringing tropical moisture into SA. On Monday, four RAAF flights were scheduled out of Adelaide to take groceries and other essentials to Coober Pedy with two more flights expected on Tuesday.
With train tracks washed away and roads underwater, including the Stuart Highway, the inland drenching has also disrupted food and other supplies to both the Northern Territory and Western Australia.
Clinton from Spud's Roadhouse in Pimba spoke with FLOW FM Australia on Tuesday. He said there were several roads already underwater north of his township and is advising all travellers to get the latest updates before heading into the area.
Clinton said as he is receiving information from travellers through the Roadhouse, he is posting that info on Spud's Roadhouse Facebook Page to keep up to date information flowing to the public.
State Emergency Service Deputy Chief Officer Liz Connell said locals should be prepared for more severe conditions and should keep clear of floodwaters. She also urged motorists to delay any travel plans to the area with many roads still closed.
Premier Steven Marshall said more rain would put extreme pressure on an already "tenuous" situation as he also called on people to cancel any unnecessary travel to the state's north.
"It is a perilous situation at the moment. This additional rain is creating havoc," he said.
"I think we've still got a couple of worrying days ahead of us.
Current estimates suggest regular rail freight routes will remain closed for at least another 12 days and possibly longer.
The Australian Rail Track Corporation said repairs were underway along a section of track more than 300 kilometres long with 18 separate damage sites identified.
Damage reports for roads across SA north continued to be hampered by high water levels making full assessments impossible at this stage.
A 14-day major emergency was declared in South Australia on Friday, allowing the state's Police Commissioner Grant Stevens to direct the movement of freight, ensure food security and coordinate relief efforts.
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