schrieb:
Also has anyone been able to climb up the sunny side of a cumulus
cloud? Read somewhere that one famous glider pilot did this and he
said it was the flight of his life.

Not only famous glider pilots. I heard some reports from some pilots in
my club.

In this document are some Information about this.
http://www.pa.op.dlr.de/ostiv/Projects/kap4.pdf
It is in written in German, but the pictures should also help you a
little. OK, you cannot see on the pictures: Cloud street waves can also
occur if sky is blue.

Andreas