In article , Raptor writes:

I rode through a dust devil today on my LSD road ride. I watched it
form in the dust on the far side of the road in front of me, then cross
the road. It largely disappeared when it cleaned the dust out but was
swirling stuff on the road around.

When I hit it, it was SLAM...SLAM. Two opposing 20-mph wind gusts in
opposite directions, about a second apart. I was ready for it just in
case. Had I not been, it might have caused me to swerve dangerously but
wasn't enough to toss me off.

I rode into one that was quite cool (on a hot summer day, it would have been
wonderful except for the face full of dirt I got), what temp did you notice? I
only remember wind from one direction. Since mine was conducting cool air down
from higher up a counter-rotation wouldn't be surprising.

Tom Gibb