Seven houses have been destroyed by bushfires burning in the Huon Valley south of Hobart, the Tasmania Fire Service (TFS) has confirmed.

Key points: The TFS said one more house was destroyed at the Riveraux Road fire in the Huon Valley

The TFS said one more house was destroyed at the Riveraux Road fire in the Huon Valley Some houses had also received "moderate damage"

Some houses had also received "moderate damage" TFS is hoping rain forecast for Thursday will ease conditions

The TFS released a statement earlier today saying eight houses had been destroyed across the state, but they revised the number to seven houses on Monday afternoon.

It said four houses had been destroyed by the Riveaux Road fire — burning in the Huon Valley — in total, and three by the Great Pine Tier fire burning in the Central Plateau.

A number of houses also received "some moderate damage".

A bushfire emergency warning was issued at 7:00pm on Monday for a fire at Great Pine Tier in the Central Plateau.

The TFS said the fire would put Brandum at "high risk within the next two hours".

There are 13 areas on watch and act alerts across the state, and 20 at advice level.

Firefighters are hoping rainfalls forecast for the coming days could help control and extinguish bushfires that continue to burn across the state.

The weather bureau is forecasting northerly showers that will move across the state on Tuesday and Wednesday, following a cold front.

The bushfires, which started before Christmas, have burned more than 190,000 hectares so far.

For the past week Glen Huon residents have lived with the glow of bushfires, reflected here on the Huon River at Ranelagh. ( Supplied: Nick Monk Photography )

The weather bureau's acting state manager Simon McCulloch said predicted rainfall could peak on Thursday, with 10 to 20 millimetres expected statewide.

Loading

"That is the most optimistic-looking rain event that we've seen in the last couple of weeks," he said.

But Bruce Byatt from the TFS said the relief that rain could bring to firefighters all depended on where and how much rain fell.

"Any rain would be a blessing, but what we will do is have a look at the impacts as to where it falls," Mr Byatt said.

"If it falls in the right places, then it could be of great value to us.

"Sadly, if it misses our fires we'll have a lot of work in front of us still."

Residents refusing to evacuate 'puts additional stress' on firefighters

Mr Byatt said some residents in the Reynolds Neck area refused to leave on Sunday night, forcing fire crews to return to evacuate them later.

"It's disappointing that door knocks to request occupants evacuate weren't followed in all cases," he said.

"It puts additional stress on our firefighting teams when we have to re-enter those environments."

Mr Byatt said critical incident stress teams had been called in to assist firefighters who were "stressed in the knowledge that they have people at risk".

"It does not make our job easier when we understand that people still are in that fire zone," he said.

Mr Byatt urged people to heed any evacuation advice from emergency services.

"We try very hard to get the warnings right so that we don't escalate them unnecessarily," he said.

"If it's reached the point where you've got police officers and firefighters doorknocking to tell you to evacuate, that's probably another level again."

A water-bombing helicopter near Glen Huon is dwarfed by the smoke clouds. ( Supplied: Nick Monk Photography )

A thank you note posted on the Franklin Fire Brigade Facebook page. ( Supplied: Franklin Fire Brigade )

Prime Minister Scott Morrison and Opposition Leader Bill Shorten both spent the morning speaking with residents who have been impacted by the bushfires.

Mr Morrison encouraged all Australians to continue to visit the state, despite the bushfire situation.

"The coffee is just as good, the salmon is better than ever … Tasmania is a wonderful place to come and visit," he said.

"I am here to stand with the people of Tasmania, I want to thank them for their great spirit … that humble resilience that we see in Australian communities all across our country, and it is very much on display here."