A smoke alert has been issued for Hobart and surrounding areas as firefighters continue to battle more than 30 blazes burning in remote areas of Tasmania's north west and west coast.

Key points: More than 30 fires burning across Tasmania

More than 30 fires burning across Tasmania Six water-bombing helicopters fighting blaze

Six water-bombing helicopters fighting blaze Conditions expected to worsen on Monday and Tuesday

The Tasmania Fire Service (TFS) said smoke from the fires was blowing over the greater Hobart and surrounding areas causing a haze.

Residents were advised to drive with their headlights on and take extra care on the roads.

It follows the closure and subsequent reopening of the Cradle Mountain area following an evacuation late yesterday.

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The TFS raised the alert level at Cradle Mountain after a wind change stirred up a blaze in the park on Saturday evening.

The watch and act alert was later downgraded to advice level.

Parks and Wildlife North West regional manager Nic Deka said the eight-hectare blaze was burning in the Dove River Conservation area.

"[Firefighters] did good work on the fire yesterday with helicopter bombing, but the reconnaissance flight this morning indicated there was still a few active edges," he said.

"We're hopeful that we are able to contain that fire and then we'll just monitor."

Mr Deka said those walking the overland track should stick to the main path and keep an eye on the Tasmanian Fire Service website for any warnings.

At this time of year Cradle Mountain has 1,300 visitors each day and about 50 people starting the overland track.

And advice alert was also issued for the Temma, Sandy Cape, Nelson Bay and Couta Rocks areas on the west coast.

Fire conditions expected to worsen

Many of the fires burning across the state were originally sparked last week.

Incident controller Shane Breen said he expected lightning strikes would trigger even more fires.

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"Obviously with the nature of a lightning strike, some of the strikes are still popping up," he said.

"So as we cross some off we're still getting some come up and we expect that that will be the pattern."

TFS acting deputy regional chief Steve Lowe said water bombers were crucial in fighting the blazes in remote areas.

"There's been a considerable amount of water bombing," he said.

"There's six helicopters currently working on the fires."

The biggest fire which is burning south of Smithton has burnt through 4500 hectares.

Mr Lowe said firefighters could not afford more blazes to start from human intervention.

"We are a bit concerned about the number of fires that started in the north of the state yesterday, certainly in relation to deliberate fire behaviour," he said.

"People lighting fires are going to take resources away from here and we need to be mindful with the warmer weather coming up we don't want any more deliberate fire starts at all."

No homes are under threat, but crews hope to make progress on the fires this weekend, before conditions worsen over the next few days.