There were 59 fires burning around NSW as of midday on Thursday, with 30 uncontained and six at 'watch and act' level. A fourth person was confirmed dead on Thursday.
A group of 11 Country Fire Authority District 17 volunteers from the Horsham district travelled to NSW on Thursday to join strike teams on the ground.
District 17 Horsham group officer Roger Perris said the group would help undertake back-burning and would maintain burns.
"We'll be away until Sunday which is quite a while, but it's all part of being a volunteer and a way we can help out," he said.
"I haven't fought fires in a different state before, it's mainly been around the Grampians and Gippsland area.
"Everyone at the moment is quite happy and chirpy, but I dare say once we start fighting the fires they won't be so cheery. We're just waiting for the unknown."
Volunteers from districts 15 and 16 formed part of a strike team that fought a fire in Wollemi National Park, northwest of Sydney on Tuesday.
The Stawell Fire Brigade said three members would return on Friday, while another would travel to Coffs Harbour on the NSW north coast to help in operations until Sunday.
Another 15 Ararat and Stawell volunteers travelled to NSW on Wednesday morning.
The NSW Rural Fire Service said more than 1,200 firefighters were working statewide on Thursday, and that conditions were predicted to worsen in coming days.
On Wednesday, Forest Fire Management Victoria deployed four firefighters from the Wimmera district and 10 from the Grampians district as part of a 28-member strike team.
Acting deputy chief fire officer Sharon Unthank said the task force would be deployed for seven days.
"(It will) increase numbers of firefighters on the ground to share the workload, combat fatigue and keep the community safe," she said.
Red Cross Emergency Services volunteers provide support through psychological first aid; the register, find and reunite service; and by serving food and water at relief centres after emergencies.
Red Cross Emergency Services Victorian manager Kate Siebert said Wimmera volunteers hadn't been requested to support New South Wales and Queensland.
"However, the teams could and certainly would if they were needed. Trained Red Cross personnel from Horsham and the Wimmera are ready to go should the need arise," she said.
"For those people who want to volunteer in emergencies at home in Horsham or around the country, we welcome your applications for future disaster responses.
"We don't send new volunteers into an active emergency response until they have completed emergency training. To see what's available, please visit redcross.org.au/volunteering."
Horsham Red Cross Emergency Services volunteer Trish Venn said she and other Horsham Red Cross volunteers travelled to Gippsland in March after the Bunyip bushfires.
"They had asked for help from us because all the local volunteers needed rest," she said.
"We helped out in the emergency centre there. People were coming in at all different times after the fires. They don't necessarily come in straight away and discover that they have needs later on."
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