Emergency warning for blaze near Braidwood

Heather McNab
Almost 150 blazes are still burning across NSW as a hot and windy weekend prompts fresh warnings

An emergency warning has been issued for a bushfire burning west of Braidwood as the NSW Rural Fire Service warns residents across the state to prepare for worsening conditions over the weekend.

The emergency warning was issued after 2pm on Friday for the 6700-hectare North Black Range fire burning in the Tallaganda National Park area.

The blaze is "spreading quickly, with numerous spot fires starting ahead of the main fire front", the RFS tweeted on Friday.

Residents in Bombay, Little Bombay, and surrounding areas west of Braidwood were advised to take shelter, as it was too late to leave.

An animal evacuation centre was set up at the Braidwood Showground.

There were 146 fires burning across NSW on Friday with 58 uncontained.

Six people have died and some 663 homes have been destroyed so far this bushfire season.

The RFS on Twitter warned of "worsening conditions" for Saturday and over the coming week.

Total fire bans will be in place for the Greater Hunter - which will be under "severe" fire danger - and the central ranges on Saturday.

The central ranges, far North Coast, North Coast, Greater Sydney, southern ranges and northwestern fire regions will also face "very high" fire danger.

The Bureau of Meteorology said NSW would feel the impact of a significant and slow-moving cold front during the weekend.

Increased winds across NSW on Saturday will lead to elevated fire danger in the central and northern parts of the state, senior meteorologist Rosemary Barr told AAP.

Very broad thunderstorm activity is also expected. Isolated storms are forecast across the southwest and far north from as early as Saturday morning.

However, the east and northern inland areas - where most of the state's fires are located - will be hit by the peak of thunderstorm activity on Saturday afternoon, with storms developing again across the northeast on Sunday, Ms Barr said.

"What we're actually expecting is for the area of elevated fire dangers to shift to the northeast."

Sydney's air quality is expected to be "poor" on Saturday, with the environment department warning this is problematic for those with illnesses such as heart or lung disease.

Ms Barr said smoke was likely to impact eastern NSW and parts of the state's west over the next few days.

Meanwhile, actor Russell Crowe - whose Nana Glen property near Coffs Harbour was hit by bushfires a few weeks ago - pledged to match a $100,000 bid by billionaire Atlassian co-founder Mike Cannon-Brookes for a South Sydney Rabbitohs cap he auctioned to raise funds for the RFS.

The $100,000 donations were matched on Twitter by Atlassian co-founder Scott Farquhar and Qualtrics co-founder Ryan Smith, taking the total raised to $400,000.

"It's reflective of the extraordinary generosity that we are seeing right across NSW and much further afield," RFS commissioner Shane Fitzsimmons said on Friday.

"Thank you once again, everybody, for the generosity."

The commissioner said the volunteer-based organisation would be sending Crowe an RFS hat to make up for the Bunnies one he'd auctioned.