We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Vortex5"
saying something like:

Anybody out there noticed any volcanic fallout yet?

Been happening here since Thursday morning, but I didn't know about the
volcano at the time and put it down to dust blowing off the fields, in
spite of a)there being no wind and b)there has been no ploughing
activity near me at all.
In retrospect, it was the volcanic stuff, as it corresponded exactly to
what others described later.