Oilpan4 wrote: ↑
Thu Nov 07, 2019 4:16 pm
70 years of putting out easy little forest fires has given us unstoppable wild fires.
Which is why the Camp Fire that burned Paradise roared over some recent past burn areas. Little trees, the regrowth from the past fires, dried out by a dry hot summer and fall, might as well have been gasoline. Right.
Fires don't follow a simple rule. Yes, some places/ecosystems do have the need for periodic fires. Some times on a nearly yearly basis, some times on a century or longer basis.
https://assets.documentcloud.org/docume ... -Sheet.pdf
Conditions immediately leading up to and during the fire combined to create a highly combustible fuel load:
Heavy grass cover due to a wet spring
An unusually dry fall
Decreased Humidity due to several recent wind events (23% dropping to 10%)
Unusually dry fuel (5% 1,000-hr. moisture level)
Hot, dry, sustained and gusting high winds (25-35 mph), including a Red Flag Warning on the day of the fire, similar to the Diablo wind or the Santa Ana winds of the California Coast Ranges.
The day of the fire, the fuel energy release component was above the historic record for November 8; the first fall rain is normally before November 1.
What does heavy grass cover have to do with past fires? Grass is adapted to fire, a yearly burn would lead to more grass cover rather than less.
Same for an unusually dry fall? Nothing.
Decreased humidity? Nothing.
Unusually dry fuel? Nothing.
Consider a river. The Nile. Not just a river.