wrote:
I can definately identify with the horizontal turbulence phenomina that
this discusses. But what I'm talking about is not the same. I've
approached this stable at min-sink and identified lift with the
altemeter. Then the vario rises quickly for about 2 second, then the
bottom drops out and I'm in heavy sink

I'm wondering if the shape/behavior of a thermal changes as it matures
and approaches a cloud (aka tops out)?

-Bruce

Read Mike Borgelt's article:

http://www.borgeltinstruments.com/Gusts.html


--
Regards,

Adrian Jansen

sounds like wave, have you tried exploring straight lines, across the
wind etc?