A major thunderstorm warning has been issued for Adelaide metropolitan areas, the Adelaide Hills and Barossa regions.
At 9:05 a.m., severe thunderstorms were detected on the weather radar near Ardrossan and Curramulka on the Yorke Peninsula.
The thunderstorms are moving east and are expected to hit the city of Adelaide just after noon.
At 9:50 a.m., severe thunderstorms were detected on the weather radar near Elizabeth and Salisbury and moving southeast.
They are expected to hit Mount Barker, Gawler and Nuriootpa at 10.20 and east of Mount Pleasant at. 10.50.
Heavy hail and harmful winds are likely.
The State Emergency Management Agency has advised people to secure loose objects, move cars under cover, stay away from fallen power lines and to stay indoors and away from windows while storms are nearby.
SA Power Networks said about 3,000 homes in the Mount Pleasant area are without power.
Across the country, more than 6,000 customers are without power, including some outages on the Yorke and Eyre Peninsulas.
The next weather forecast is issued around kl. 10.50.
A more general warning of severe thunderstorms is also current for the Adelaide Metropolitan, Mount Lofty Ranges, Lower Eyre Peninsula, Yorke Peninsula, Flinders, Kangaroo Island and parts of the West Coast, Eastern Eyre Peninsula, Mid North, Murraylands, Upper South East and North Eastern Pastoral Districts .
More on the way.