Much of central Queensland is on high alert this morning as several massive bushfires threaten properties and lives across the state.

Wind from a trough moving east over the state, combined with a hot and dry air mass, will result in an unprecedented fire danger, with fears a blaze north of Bundaberg could develop into a firestorm.

"These are conditions that we've never seen before, fire conditions that we've never seen before," fire analyst Inspector Andrew Sturgess said.

An abundance of dry fuel means new blazes spark quickly. (9NEWS)

A waterbombing aircraft dumps water on the blaze. Pilots say the smoke is making it hard to see what they're doing. (9NEWS)

Overnight, the fire at Deepwater National Park, 375km north of Brisbane, continued to burn.

“(The) intense fire is travelling in a south-westerly direction towards Muller Road,” QFES said in a statement.

“It is expected to impact Baffle Creek, Rules Beach and Oyster Creek in the coming hours. The fire is expected to have a significant impact on the community.”

The fire has burned 20,000 hectares and destroyed at least four homes since it started in Deepwater National Park on Saturday.

Firefighters are exhausted, some working more than 26 hours straight, while water-bombing pilots are struggling to see their targets through the smoke.

(9news)

Police have been banging on doors in Baffle Creek, Deepwater, Oyster Creek and Rules Beach, where Gladstone Mayor Matt Burnett says some locals have dismissed advice to get out.

"When you have a police officer knock at your door saying a fire is coming, it is time to get out; it's serious," Mr Burnett said yesterday.

"There is no one in that area that is safe to stay."

"I know that some people may not want to leave their homes," Premier Annastacia Palaszczuk said.

"I know that this is an extremely difficult situation, but I need you to listen to authorities and you must leave immediately."

Some Deepwater residents have been plucked from the direct path of the fire at the last minute while others have jumped in to help emergency services shield their properties.

Horses struggle to graze in charred paddocks. (9NEWS)

"There's probably been a combination of people leaving it a little bit late to get out but also not understanding or realising the intensity of the fire," Rural Fire Service regional manager Brian Smith said.

"People haven't experienced a fire of this intensity and this speed before in that area, so although they've had a number of fires over the years, this fire was particularly fast moving and intense when it got going."

Those who have evacuated will likely have to wait days to return to what remains of their homes and livelihoods.

Another large blaze is also threatening Dalrymple Heights, 100km west of Mackay.

The roof of his shed appears to have collapsed. (9NEWS)

Charred trees line the perimeter of this property. (9NEWS)

The brick and tile home was razed by fire. (9NEWS)

The shells of two cars. (9NEWS)

Residents have been told to evacuate as fire closes in on Dalrymple Road, in the vicinity of Snake Road and Chelmans Road.

An evacuation centre has been set up at the Marian Town Hall.

Police in Dalrymple are helping with evacuations and residents have been warned not to return.

"Conditions are getting worse," QFES said.

"It is now very dangerous and firefighters may soon be unable to prevent the fire advancing."

Conditions are expected to worsen today with temperatures to soar above 40C, with the winds intensifying.

THE DEAD MAN ZONE

Inspector Sturgess explained the unpredictability of fire in windy conditions.

He said firefighters typically work on the long flank of the fire, rather than the head of the fire which is the fastest-burning, most intense area.

If the wind changes, the flank can quickly develop into a rapidly developing head fire.

"We've gone from maybe a few hundred metres head fire to maybe kilometres of a flank fire that is now a head fire that is moving incredibly rapidly across the landscape.

Reinforcements arrive in Agnes Water from New South Wales. (9NEWS)

"In basic firefighter training that's known as a dead man zone and it's known as a dead man zone for a reason."

Bureau of Meteorology State Manager Queensland Bruce Gunn confirmed there was a wind change associated with the trough that could see the fire front broaden dramatically.

MORE HELP ON THE WAY

Exhausted local crews have had their spirits lifted by 107 firefighters who arrived yesterday from New South Wales.

A further 100 will arrive in the coming days and another 225 have been requested from other states, Queensland Fire and Emergency Services Commissioner Katarina Carroll said.

"There will be no rain and no respite," she warned.

The premier said personal hardship grants were now available.