This is just the latest in a series of large scale fires made worse by the no-burn policy. The most well-known (and perhaps the biggest) was the fire in Yellowstone some time back (700,000 acres +). The post-fire analysis determined that the natural cycle in the area was for the forest to grow more or less continuously for 200-300 years and to reach a state in the latter part of that period where is was ready for a really large scale burn. When it happened was primarily determined by weather considerations, especially during extended drought periods, but it eventually happened. And the size was determined primarily by how long it had been since the previous large scale burn.
The obvious solution to this is to reduce the density of old trees in the forest on a continuing basis so as to lessen the accumulation of prime burn material (logging to the uninitiated) but this is so politically incorrect that it will never be done, even under sufficient control to minimize ground damage. Instead, the city eco-freaks will press for more fire suppression so that the next fire will be even larger.