SA bushfires prompt watch and act warnings

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South Australian residents have been told to take action as three bushfires burn out of control in hot and blustery conditions.

The Country Fire Service has issued watch and act alerts on Sunday for grass blazes burning near Deepwater, Meningie and Eden Valley.

"Take action now as this bushfire may threaten your safety," the warning said.

"If you are not prepared, leave now and if the path is clear, go to a safer place. Do not enter this area as conditions are dangerous."

The Deepwater fire at Taunta Hut Road is moving toward Cantara Road and Bunbury Road Gum Lagoon, while the Meningie blaze at Moonee Hills Road is moving in the direction of Field Road and Boundary Road

The Eden Valley blaze at Jutland Road is heading to Marne River.

All three fires are burning uncontrolled and being fanned by south-easterly winds.

A total fire ban is in place for eight districts across the state at severe to extreme risk of bushfires.

The mercury reached 37.9C in Adelaide on Sunday amid a severe thunderstorm warning for damaging wind gusts up to 90km/h for parts of Flinders, North West Pastoral and North East Pastoral districts.

Marla, Coober Pedy, Roxby Downs, Leigh Creek, Oodnadatta and Marree have been identified as potentially in the path of the storm.

The Bureau of Meteorology reported gusty thunderstorms about eastern districts had raised dust and produced 1cm hail near Waikerie.

Little or no rain is expected raising concerns that lightning could spark fires.

A similar system that passed through on Tuesday resulted in more than 300,000 lightning strikes, starting several significant fires including some which threatened towns on the Yorke Peninsula.