Two fires in Fingal were upgraded to Advice Level on Sunday after the Tasmanian Fire Service began back burning towards the fire fronts to reduce the intensity of the inferno once it reached their containment lines.
The back burn is taking place near Rossarden Road, near the Pepper Hill Forest Reserve to meet the main fire fronts.
TFS fire incident controller Steve Lowe said an area of about 1000 hectares was planned to be burnt off near Mangana, Craggy Peaks and Rossarden.
"The level was raised to make people aware we are doing a large back burn today [Sunday], which means people will see increased smoke in the area," he said.
"We are lighting now and it will be monitored over the next two to three days."
Fingal's Mangana Road bushfire, which has burnt more than 11,200 hectares, is at Advice Level and the Mount Malcolm bushfire, which has burnt 8010 hectares, had no alert level on Sunday.
MORE ON THE FINGAL FIRES:
- Rainfall will not significantly help Fingal fires
- Fingal student assisting bushfire response
- Work continues at Fingal fires to protect assets
- Emergency services keep Fingal fire away from exposed coal seam
- Fight to protect Douglas-Apsley National Park from Fingal fire intensified
- Robert Peter Matthewson, 35, charged with deliberately lighting Mangana fire
- Self-sufficient 'utopia' built over 10 years destroyed by Fingal fire
Mr Lowe said further burns were planned to go ahead in Fingal in upcoming days but the timing would all be dependent on the weather forecast.
"Conditions increase in fire danger leading into Tuesday and Wednesday so we are taking all available opportunities to consolidate boundaries through back burning where we can based on the prevailing wind directions," he said.
"There is forecast higher temperatures, relatively low humidity and although the wind strength isn't forecast as being too strong at this point in time that could change."
The Bureau of Meteorology is forecasting maximum temperatures of 27 degrees on Tuesday with lows of 22 degrees and 31 degrees on Wednesday with lows of 26 degrees in Fingal and the East Coast region.