Firefighters are battling an uncontrolled bushfire near Miena in Tasmania's Central Plateau, with people in the small town warned the blaze could place them at "high risk".

Key points: Two fires in burning at opposite ends of Little Pine Lagoon are being met with a heavy response by emergency crews, with multiple aircraft and dozens of teams despatched

Two fires in burning at opposite ends of Little Pine Lagoon are being met with a heavy response by emergency crews, with multiple aircraft and dozens of teams despatched People are being told to activate their bushfire survival plans immediately, with winds forecast to increase fire activity and unpredictability

People are being told to activate their bushfire survival plans immediately, with winds forecast to increase fire activity and unpredictability Staff at the Great Lake Hotel say they are "ready" to evacuate, if the situation worsens

The fire, which so far has burned across approximately 4,000 hectares, is one of 46 ongoing fires in Tasmania, necessitating a call-out to mainland fire services for assistance.

This afternoon, three waterbombing aircraft, 12 heavy tankers and dozens of other firefighting appliances have swing into action in bushland near Little Pine Lagoon, approximately 10 kilometres west of Miena, a small community in the central highlands.

Photos of the fire were posted on social media, with one showing plumes of smoke billowing from the shore of Little Pine Lagoon, taken from the safety of a boat, with the unidentified photographer captioning that they had been "ordered off the water".

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The Great Lake Hotel, at Miena, posted on their page that they were "ready" for evacuation, should it come to that.

"No evacuation order yet. TFS (Tasmania Fire Service) and Tas pol (police) have been awesome in communicating current conditions. If anything changes I will advise."

The fire seen from the Marlborough Highway, just south of Miena near Little Pine Lagoon. ( Supplied: Azra Clark )

Deputy TFS Incident Controller Brett Fazackerly said people should avoid the area unless it was absolutely necessary.

"As the day has warmed up, we have seen a significant increase in fire activity," he said.

"At this stage, our air attack and ground crews are holding [containment] lines west of Miena."

Inconsistent winds are pushing the fire in various directions.

Deputy Controller Fazackerly said the priority for fire crews in the short term was to protect to township of Miena, with authorities going door to door to inform residents of the situation.

Marlborough Highway is closed in its entirety from the Great Lake Hotel in Miena to Bronte Park.

Heavy machinery is also being brought in to bolster containment lines.

Smoke from the bushfire visible from Miena. ( Supplied: Kaleb Clark )

A nearby fire at Great Pine Tier which yesterday was downgraded has been pushed back up to watch and act level today, with anyone in the area urged by TFS to "activate your bushfire survival plan now".

"Forecast winds will increase fire activity in the area throughout the afternoon. This fire may put Lake Fergus, Little Pine River, Little Pine Lagoon, O'Dells Lake, Lake Flora, Double Lagoon, First Lagoon and Lake Kay and the Nineteen Lagoons area at high risk this afternoon."

The TFS said the fire, which had burnt around 4,500 hectares, would be "difficult to control".

"There may be embers, smoke and ash falling on Lake Fergus, Little Pine River, Little Pine Lagoon, O'Dells Lake, Lake Flora, Double Lagoon, First Lagoon and Lake Kay."

Aircraft and heavy tankers, along with dozens of other crews are engaged in fighting the fire, with people who are not locals urged to stay clear of the area.

The current TFS advice for people in areas under watch and act advice level is: