Firefighters across South Australia are on high alert amid soaring temperatures and high winds.
Catastrophic conditions have been declared for the Mt Lofty Ranges and in the upper and lower southeast on Saturday.
The state's 12 other districts are either severe or extreme with authorities considering the conditions to be the worst for several years.
Adelaide will have a top temperature of 41C while the mercury is forecast to reach the mid-40s in some regional and outback towns.
A strong cool change is also expected to sweep across SA during the day, reaching Adelaide mid-afternoon, with the changing conditions adding to the fire risk.
Country Fire Service chief officer Greg Nettleton says the combination of high temperatures, strong winds and low humidity is a "recipe for fire".
He expects the worst of the conditions to come around the time of the wind shift but is thankful no lightning has been forecast.
The CFS is already monitoring three fires contained during the week, including a large hayshed fire at Mintaro, a grass fire at Myponga and another small blaze at Paskeville.
Those fires are not expected to cause any issues.