The thousand hour dead fuel moisture charts show northern California (indeed much of the west) are down in the 6 to 10% range. 1000 hr fuels represent the large dead woody fuels on the forest floor like logs and large branches. Large diameter dead woody material is the primary progenitor of very big forest fires and extreme fire behavior. Large amounts of dead fuels are present in most of our forests now due to a century of fire exclusion and suppression. The dryness of these fuels is currently at levels normally observed in late summer.

Current 1000 hr. dead fuel moisture chart for the US.
[link to www.fs.fed.us]

These fires are going to be unforgiving and historic in magnitude. A GLP prediction that will come true.