The Blue Mountains bush fires were very impressive so I time-lapsed them! So how do they form? As the plumes rise beyond the freezing layer consequently forming cloud. These clouds are known as pyrocumulus.
Just after the Southern Tablelands cell intensified it showed interesting structure. The timelapse I guess confirms that too. Strong outflow pushes out in the timelapse. At the time of this photograph and just prior though, strong inflow raced in from the northeast!
Was it an outflow boundary from the the supercell now in Nowra? Or was it rapidly rising updraft not sure - https://youtu.be/qTcU5ckJ_fc Timelapse (yes I know it is heavily processed but I had to as the contrast at the time was not the best but the structure was evident)
The Green Wattle Fire burned through thousands of hectares of land. Spectacular national parks and wilderness went up in flames! The pyrocumulus timelapse filmed here is the of the Green Wattle Fire. The bush fire had been going for many weeks but it consequently flared up once more. The whole region was devastated. Pyrocumulus clouds developed when strong fire plumes rise. As smoke rises it finally cools to a temperature that allows the smoke particles to condense into cloud.
Coincidentally, Penrith recorded a temperature of 48.9C - a greater Sydney record set in 1939! Incredibly, it was so hot you could fry an egg!