At 3pm, wisps were blowing up from the mountaintops. By 4pm, if you were in the car you were driving with your headlights on. If you were walking you might have had a mouth full of grit.
It's what's left on the ground in the mountains from the Station Fire, now known to be "the largest fire in the recorded history of the Angeles National Forest." There's no vegetation to hold down the thick layer of ash when the Santa Ana winds pick up. The winds were expected to get up to 70mph in the mountains last night.
For some people this is a plus. If you don't mind a bit of eye sting you can have a golf course to yourself. For our part, we enjoyed a lawn furniture ballet as dinner entertainment, and our back yard has been nicely landscaped where it wasn't before.