Smoke From Tasmania's Fires Has Made Its Way To New Zealand

Smoke from Tasmania's numerous bushfires is being spotted as far away as New Zealand as parts of the state remain at threat from blazes up to 20,000 hectares in size.

The greatest threat on Monday was posed by an "erratic" fire burning near Geeveston, southwest of Hobart, where about 400 people have evacuated their homes.

Infrastructure damage has been minimal but "the risk to life and property remains high" Tasmania Fire Service Deputy Chief Officer Bruce Byatt said.

Six emergency warnings were in place for the 20,000-hectare blaze, known as the Riveaux Road fire, which is also close to the centres of Judbury, Port Huon, Castle Forbes Bay and Lonnavale.

The threat is likely to last until the early hours of Tuesday and unprepared residents should evacuate.

There are two other emergency warnings for the central Great Pine Tier fire which has been burning for almost a fortnight.

"Clearly the whole of Tasmania is impacted by smoke and we've even had reports from as far away as New Zealand has been impacted by the Tasmanian fires," Byatt said.

It comes after bank branches near areas ravaged by the fires decided to remain open despite the Australia Day public holiday, giving victims the chance to cash assistance grant cheques.

The ANZ and Commonwealth bank branches in Huonville, southwest of Hobart, will open on Monday for a short period.

READ MORE: Fires Threaten Lives In Central Tasmania

While fire conditions have eased compared to recent days, residents have been told to remain vigilant with the threat forecast to escalate by midweek.

The Bureau of Meteorology warned that Wednesday would be the hottest day for the week, bringing very high-to-severe fire danger ratings, before possible rainfall and thunderstorms, as a cooler change moves through.

Image: Getty
Smoke from multiple wildfires seen across the Derwent River in Hobart. Image: AAP

"These (fire) alerts will be in place in towns and communities informed for as long as it takes to ensure they're safe," Regional Chief Jeremy Smith said.

Authorities are closely watching firefighters, some of whom have been working frontline shifts since before Christmas.

"We're monitoring and providing rest wherever we can and also looking right across the whole state about moving resources if required," Mr Smith said.

Interstate and New Zealand crews are already helping the Tasmanian fire battle and other equipment, including a 737 aircraft, could be borrowed, he added.

Some of Tasmania's National Parks remain closed as the fires continue, with the situation being closely monitored and reconsidered daily.