The firies got stuck north of Glenreagh.
Luckily they were able to extract themselves, but their truck remained stranded.
A group of firefighters were caught in floodwaters in northern NSW.(9News)
A large portion of New South Wales remains on high alert for floods and thunderstorms.
Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding in areas extending from Canberra to Walgett in northern NSW.
Locations that may be affected include Orange, Canberra, Goulburn, Tamworth, Gunnedah, Narrabri, Walgett, Dubbo and Parkes.
Residents in flood-affected areas in Queensland and NSW, particularly near Coffs Harbour, are today being urged to be aware as more rain is forecast to pack a final punch today before conditions ease tomorrow.
Around 40mm of rain could fall today.
Authorities say the conditions have not been seen since Cyclone Debbie in 2017.
An evacuation order is in place for Condong, Tumbulgum, Tygalah and surrounding areas along the Tweed River.
The SES says it s the final flood warning for the Tweed, with waters likely to begin receding today allowing for a clearer picture of the damage below.
A series of minor flood warnings have been issued for other rivers in the region.
Further south near Coffs Harbour, a high tide is likely to hit at 10.30am.
The weather bureau has predicted possible flooding for low lying areas in the North Macksville areas.