The Tasmanian Fire Service is battling dozens of bushfires burning across the state in hot and windy conditions.
Strong winds and temperatures reaching into the high 30s are expected to intensify the fires.
Bushfires in the areas of Forcett and Lake Repulse have burnt more than 1,000 hectares and are spreading rapidly.
The Forcett fire has jumped the Arthur Highway, sparking spot fires nearby.
Police have closed the highway from Forcett to Copping.
The fire service says cars are being allowed to leave the area but only emergency services vehicles are being allowed in.
Forty fire crews are battling the blazes and a water-bombing helicopter is being used at Lake Repulse.
Fire Service spokesman Jarrod Read says residents near the Forcett and Lake Repulse fires should not wait until it is too late to leave.
"Given the conditions, firefighters may not be able to control the fires today," he said.
"Community fire refuges have been set up at Ouse and Sorell."
Tasmanian activist Miranda Gibson is closely monitoring the bushfires, which are close to the forest where she has been staging a tree-sit protest for more than a year.
She is living on a 60-metre platform in a tree in the Tyenna valley, about 50 kilometres from the Lake Repulse fire.
Ms Gibson says she is prepared to abandon the protest if the situation becomes dangerous.
"I'm lucky enough to have quite a good view of the surrounding area," she said.
"I'm up quite high. So just keeping an eye on if I can see any smoke or any fires in the distance as well."
Meanwhile a fire at Woorak Road near Epping Forest in the Northern Midlands is expected to threaten an area east of Conara Junction on the Esk Main road this afternoon.
Motorists are being warned of possible ash and embers on the Midland Highway, and Glen Esk Road is closed.
Residents are being urged to leave their homes as a precaution.
A total fire ban in Tasmania came into force at midnight.
A bushfire which caused the evacuation of the Richmond caravan park east of Hobart yesterday has been controlled and contained.
The fire off Middle Tea Tree Road has been downgraded to the
A blaze at Four Mile Creek in the north east has also been downgraded to the advice level.
Fire crews were able to bring the fire at David Gully Road under control yesterday afternoon after battling it on steep terrain and in dense forest.
Crews are also monitoring fires at Friendly Beaches near Coles Bay, Tasman Highway at Bicheno, Hines Road at Whitemark, Woorak Road at Epping Forest, Rhyndaston Road at Rhyndaston and Quicksand Road at Latrobe.
Meanwhile, Tasmania's Parks and Wildlife Service has closed the Mount Field National Park, near the Lake Repulse fire, until further notice in the interests of public safety.
It has also closed tracks in the Freycinet, Maria Island, South Bruny and Douglas Apsley national parks.
The Hobart City Council has shut bushland reserves and the Pinnacle Road on Mount Wellington because of the bushfire risk.