A massive 41,000-hectare bushfire in Victoria's Grampians has caused significant concern for firefighters by creating its own weather system.

The fire has caused a 12-kilometre convection column that has created thunderstorms and lightning.

ABC weather expert Graham Creed says a pyrocumulus cloud in the Grampians was triggered by heat and intense updrafts, and could result in damaging winds as well as potentially large hail.

Officials confirmed a woman died in the Grampians fire whilst at least two homes were destroyed in South Australia's Eden Valley north-east of Adelaide.

Firefighters had to battle another day of stifling conditions and while a cool change is predicted, it is bringing wind gusts of up to 120kph that have the potential to start new bushfires.

Look back at our blog to see how the day's events unfolded.