A hot sleep for Northern Tasmanians on 35 degree day

Tasmania's emergency service are responding to multiple bushfires, including an uncontrolled fire travelling towards Dee Lagoon in the state's centre.

Up to 20 aircraft were working on a fire in Tarraleah on Thursday afternoon.

Fire services are still working on a bushfire called in Strahan at about 2pm.

Bureau of Meteorology meteorologist Luke Johnston said extreme fire danger was reported across many sites in Tasmania, with temperatures of 35 degrees likely to rise over the afternoon.

Mr Johnston said wind gusts were occurring at 80 to 90 kilometres per hour in the south.

He said the weather was expected to change at about 10 pm in the south.

"The combination of significant high-temperatures and strong gusty north-westerly winds has led to a huge increase in fire danger," Mr Johnston said.

"The change is going to take even longer to get to Launceston and the North-East, potentially not until tomorrow morning ... it's another hot night for places in the North-East."

A vegetation fire also broke out within regeneration forest coups in central Tasmania, with services constructing a mineral earth firebreak to contain.

There was also a fire in southern Tasmania at Crabtree.

Tasmania Fire Service (TFS) deputy chief officer Matt Lowe said the five fires reported in the Bradys Lake, Central Highlands were "not normal" and would be investigated.