Flood-weary South Australians are facing another bout of wild weather with a storm front expected to drop up to 60 millimetres of rain to most districts.
Temperatures have climbed above 40 degrees Celsius in the state's north, with 45.4C at Moomba and 43.1C at Oodnadatta, ahead of a rain band which will cross the state from the west.
A severe weather warning for heavy rainfall and damaging wind is in place for the West Coast, the Eyre and Yorke peninsulas, the Mid North, Kangaroo Island, the Mount Lofty Ranges, Adelaide and the South East, as well as parts of the Flinders, Murraylands and North West Pastoral districts.
The weather is forecast to develop in the west overnight and extend east into early Friday morning with thunderstorms expected.
A severe thunderstorm warning for heavy rainfall and damaging winds is current for parts of the West Coast and North West Pastoral districts.
Winds of about 50 to 65 kilometres per hour are expected, with gusts in excess of 90kph possible in elevated areas.
A flood watch has been issued with rainfalls of between 20mm and 60mm forecast over parts of the North West Pastoral, West Coast, Eyre and Yorke peninsulas, Kangaroo Island, Mid North and the Mount Lofty Ranges, including Adelaide.
Isolated falls of up to 80mm are possible and most likely over the Mount Lofty Ranges early on Friday morning, the Bureau of Meteorology warned.
"We're also concerned that we may see some minor flooding in the Upper Onkaparinga and the Upper Torrens catchments," meteorologist Paul Lainio said.
The State Emergency Service (SES) and CFS are handing out sandbags at six locations across Adelaide ahead of the weather.
SES units at Campbelltown, Enfield, Lynton and Noarlunga, as well as the CFS brigades at Bridgewater and Burnside, will be helping to fill sandbags between 4:00pm and 8:00pm.
Tea Tree Gully Council has also offering sandbags from its depot.
South Australia has experienced storms on almost a regular basis since Spring, with the most severe resulting in flooding and extensive and lengthy blackouts.
Adelaide exceeded its forecast top of 36C this afternoon, with the mercury climbing to 37.2C.
Repeat instances of storms and heavy rains 'unusual'
BOM senior forecaster Vince Rowlands said the conditions were not unheard of in January but it was unusual to have repeated instances of storms and heavy rain.
"There's a lot of moisture that seems to be hanging around particularly the northern parts of the state and this event coming through is just grabbing that moisture and bringing it south," Mr Rowlands said.
"[There will be] quite a bit of weather, as far as rainfall and thunderstorm activity goes," he said.
SES deputy chief officer Dermot Barry said the combination of heat, high winds and high rainfall could pose significant issues with children on holidays and homes unprepared for the severe weather.
"I would urge people to plan ahead to ensure that their gutters are clear and that all loose items around the home are secured," Mr Barry said.
He urged people not to park cars under trees, to consider the welfare of vulnerable residents in the heat and not to camp along waterways.
"With many thousands of children on holidays, the upcoming severe weather conditions may place many of them at potential risk, parents should be extremely aware of their whereabouts at all times, and if possible keep children inside," he said.
"If you're in low-lying areas, or people who've pitched [campsites] in the rivers and those kinds of things, they need to be conscious of that.
"If they're planning to come home soon, it may be a great day to pack up today and come home a bit early."ABC