"Geoffrey Barnes" wrote in message news:2usWc.1623$Y%3

But I didn't think of that at the time, and I
wasn't convinced that I could stay legal if someone in authority decided
that pillar of vapor coming from the steel plant constituted a "cloud".

I don't know, but during my PPL training, pre-solo departing Troutdale, OR,
we flew through a papermill steam cloud over Camas, WA. Instant karma; had
us both gagging.

-c