A massive wildfire in southwest France has created a 'pyrocumulonimbus' cloud, a rare and dangerous phenomenon that can generate its own weather system and worsen fires. This type of cloud has never been seen before in France, but is common in wildfire-prone areas like Australia and North America. The fire has forced the evacuation of over 200,000 people and has destroyed hundreds of homes. Firefighters are struggling to control the blaze, which is spreading rapidly and unpredictably.