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Firefighters say bushfires burning across the state could "go gangbusters" today as more scorching weather bears down on NSW.
A statewide total fire ban is in place as authorities brace for temperatures to reach the low- to mid-40s in some parts of the state.
NSW Rural Fire Service said the hot forecast meant there would be no reprieve from the 100 fires burning across NSW late last night, of which 16 remained uncontained.
An RFS spokeswoman told AAP strong winds forecast for today would exacerbate the fire threat.
"The fires, given they're already burning, they may well and truly go gangbusters."
Three fires had caused major concern last night, the RFS advised.
About 150 firefighters worked to contain the Deans Gap fire about 12km east of Sussex Inlet, in the Shoalhaven.
In the state's southwest, the Cobbler Road fire in the Jugiong area, near Yass, was burning close to properties, with about 90 firefighters at the scene.
The Yarrabin fire burning in the Kybeyan Valley 20km east of Cooma had burnt 9400 ha by last night, the spokeswoman said.
"Firefighters are concerned that the hot weather [today] and Saturday is going to have a negative impact on that fire."