The Tasmanian Fire Service says an uncontrolled bushfire in Pelham in the state's South could now put homes and lives at risk.
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The service issued a warning to residents over embers from the fire, which ignited in the Derwent Valley early on Monday afternoon.
"Thick smoke and thousands of embers will cause fires all around you," it said.
"Fires will move quickly and may come from many directions.
"Thick smoke and thousands of embers will cause fires all around you.
"Fires will move quickly and may come from many directions."
The fire was the most serious of several which started on Tuesday.
A bushfire was ignited at Strathgordon and responded to by local crews.
The service reported at 4pm the fire might put Strathgordon and the Gordon River Road at severe risk this afternoon.
A bushfire was reported at 5pm on Mangana Road at Fingal.
Bureau of Meteorology state manager Simon McCulloch earlier in the day said temperatures in parts of Tasmania on Monday look to have broken a number of records for December.
Hobart recorded a temperature of 40.8 degrees which was just short of the all-time record of 41.6 but the hottest on record for December.
Launceston was predicted to have broken its December record when it reached 33.5 degrees in the afternoon.
Mr McCulloch said Hobart's temperature rose by eight degrees within 10 minutes during the day.
He said lightning activity was expected in parts of the state, particularly the South-East and upper Derwent Valley, in the early evening.
Tasmania Fire Service chief officer Chris Arnol said it was anticipated that units in other parts of the state would have to deal with fires caused by lightning on Tuesday.
Mr McCulloch said temperatures were expected to drop to the low 20s on Tuesday which would reduce the fire danger rating.
A mist of smoke has covered the East Coast as a result of bushfires burning in Victoria and New South Wales.
A total fire ban was enacted in the North and South on Monday.
Tasmanian Parks and Wildlife Service general manager Jason Jacobi said it was a concern that campers were still lighting camp fires in parks and reserves that were covered by the total fire ban.