What are pyrocumulonimbus, the clouds making France's wildfires so unpredictable?
Experts say the fire that has been raging near Bordeaux for four days remains especially unpredictable because it is creating its own weather conditions. This is a rare phenomenon in France.
<p>Experts say the fire that has been raging near Bordeaux for four days remains especially unpredictable because it is creating its own weather conditions. This is a rare phenomenon in France.</p>