Its the 4th programme. They've already done programmes about the perfect super tornado, London getting flooded, solar storm affecting the whole world, and tonight the perfect fire storm.
The action focusses on Sydney, Australia. About how massive forest fires turn into one massive firestorm (energy output equal to 30 Hiroshima) combined with pyrocumulus clouds.
Its a documentation - dramatisation and uses computer FX. Quite good.
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