UPDATE 6.14pm: It has been confirmed that the two fires have now joined up.
Previously: An Emergency Warning has just been issued for the Kian Rd fire at Buckra Bendinni.
The fire has breached containment lines due to strong winds and is moving towards South Arm and McHughs Creek.
The Fire Control Centre said the fire is behaving erratically and spreading quickly.
An Emergency Warning is the highest level of bush fire alert. You may be in danger and need to take action immediately. Any delay now puts your life at risk
Meanwhile the Fortescue Creek fire continues to spread in multiple directions and is also at Emergency Warning level.
South Arm Road is closed to the west, from the Williams Hill Road intersection.
Advice from RFS for nearby residents
If you are in the area of South Arm and McHughs Creek, seek shelter as the fire impacts.
Protect yourself from the heat of the fire by sheltering in a solid structure.
An Evacuation Centre has been established at the Bowraville Anglican Hall at Young Street, Bowraville.
A further evacuation point has been set up at Macksville High School, Boundary Street, Macksville
People are encouraged to use the 'Register.Find.Reunite' website here: https://register.redcross.org.au/
Continue to stay up to date with the bush fire situation by checking http://www.rfs.nsw.gov.au, listening to your local radio station or by calling the NSW RFS Bush Fire Information Line on 1800 679 737.