Tas firies claim cautious breakthrough

More than a month after the battle started to control a bushfire in southwest Tasmania, authorities are cautiously claiming a breakthrough.

First reported on January 17 and believed to have been started days earlier by a series of dry lightning strikes, the blaze at Gordon River Road, Mount Cullen has since burnt through more than 4000 hectares of remote forest, but is slowly being reined in.

"There are several more weeks ahead of mopping up in this area, however we are cautiously optimistic that the fires in the southwest are unlikely to extend further," Tasmania Fire Service chief Gavin Freeman said on Wednesday.

There are still more than 25 uncontrolled bushfires across Tasmania, including three that are causing six alerts as they give off smoke, ash and embers.

"The milder weather conditions forecast for most of the state for the remainder of the week will allow firefighters to do extensive work strengthening containment lines in fires in the northwest, including the Mawbanna and Wuthering Heights Road fire," Mr Freeman said.

Rain and wind has hampered some aerial operations but crews are walking into fire grounds to extinguish hot spots and consolidate control lines.

Some 350 Tasmanians are working to battle the fires, along with more than 300 recruits from interstate and New Zealand.

A makeshift tent city has been set up at Stanley in the state's northwest to accommodate visiting personnel.´