Wild weather will lash parts of the country on Friday, threatening severe flooding into the weekend.

Emergency services are preparing for a busy weekend with severe thunderstorm warnings issued for South Australia and Victoria.

The Bureau of Meteorology has issued a flood watch warning to SA residents, who could experience its heaviest rainfall in 30 years, as a system develops in the north and tracks south-east during the coming days.

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The warning comes just hours after the devastating Adelaide Hills bushfires were contained by authorities after seven days.

The State Emergency Service is sending sandbags and swift-water rescue teams into SA’s north where a major summer rainband is brewing.

The biggest falls of up to 200mm are expected over higher areas of the eastern Mount Lofty and Flinders Ranges.

SES officer Dermot Barry said campers in those areas should consider leaving.

Other areas of SA could get as much as 150mm, with up to 50mm expected to fall in Adelaide.

Meanwhile, Victoria’s north-west is expected to experience some serious rainfall through to Gippsland on Friday.

The rain band may lead to flash flooding in those areas later in the afternoon, with Melbourne also set to receive about 20mm.

Bureau of Meteorology meteorologist Andrea Peace says the weather is expected to get worse over the weekend.

Ms Peace said north-east Victoria would likely get the heaviest falls, up to 30mm of rain.

Downpours are expected to help firefighting efforts in north-western parts of Victoria.

“All fires are contained at the moment,” State Incident Control spokeswoman Andrea Mason said.

“But there are still a fair few advice warnings.”

During the next 24-hours Queensland’s coast, southern NSW, Tasmania and Northern Territory’s Top End will be drenched with rain, and people should be across any flood warnings for their location.

The SES has warned residents in fire-affected areas to be aware of the potential for landslides and debris across roads.