Sydney's Royal national park still closed after bushfire that forced boat rescues

A total fire ban has been declared for the Greater Hunter Central Ranges Southern Ranges Northern Slopes and North Western areas

A total fire ban has been declared for the Greater Hunter Central Ranges Southern Ranges Northern Slopes and North Western

'Their objectives are to protect properties, attack and contain the main fire and contain spot fires, ' the ACT Emergency Services Agency said.

FIREFIGHTERS are battling several serious bushfires in NSW, with one threatening homes in the NSW Southern Tablelands, and the other forcing the closure of the Royal National Park in Sydney's south.

The blaze was being treated as suspicious with specialist investigators heading into the park on Sunday, a New South Wales police spokeswoman said.

The Greater Sydney Region has been issued with a very high fire danger rating and the NSW Rural Fire Service is encouraging residents to monitor conditions.

In Adelaide, a thunderstorm brought more than 7000 lightning strikes, sparking minor fires across the city.

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More than 100 firefighters battled the blaze on Saturday evening, supported by water bombers and aircraft.

"We're not having any major changes in temperatures, unfortunately, generally over the whole state the severe heatwave is predominantly going to continue", meteorologist Jordan Notara told AAP.

A bushfire in the Royal national park had burnt through 600 hectares by Sunday morning.

Firies are also paying close attention to a large bushfire near Tamworth in the state's north that has already destroyed more than 48,000 hectares, as winds strengthen on Sunday afternoon.

Embers are believed to have caused a second fire nearby on Sir Bertram Stevens Drive at Flat Rock in the park.

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