Total fire ban for northwest Tasmania

A total fire ban has been declared for parts of northern Tasmania as the state's over-stretched firefighters try to reduce the risk ahead of high forecast temperatures.

An area including Launceston, Devonport, King Island, the west coast and northern Midlands will be subject to the ban for all of Tuesday, with Tasmania Fire Service chief Gavin Freeman saying authorities had no other choice.

"It is simply based on the amount of work we already have," he told reporters.

Conditions are dry and the Bureau of Meteorology is forecasting 32C at several centres along with high winds.

"Tasmania Fire Service has also needed to consider the number of resources already deployed to the large number of fires on the west coast when assessing the need for a total fire ban in that region," Mr Freeman added.

Many of the blazes are in remote bushland and were started last week during a lightning storm.

An alert is in place for one of the fires that is burning in the Dove River Conservation area at Cradle Mountain.

The eight-hectare blaze poses no immediate threat but authorities have issued a warning to trekkers on the Overland Track as aircraft conduct water bombing.

Meanwhile police are looking for the occupants of a suspect car that was spotted in the area where a number of fires were deliberately lit on Saturday.

There were 12 fires started alongside the Tasman Highway between Launceston and Scottsdale and a green sedan, similar to an older model Mitsubishi Magna, was seen nearby.

Detectives are keen to speak to whoever was inside the car, along with the rider of a yellow motorcycle.