Turbulence and airspeed

That makes a LOT more sense to me than the commonly labeled "UPdraft",
which
implies a wind from below. True UPdrafts only make sense to me near the
ground, where wind over ground obstacles can create eddies and currents,
much like water in a stream burbles around rocks and other obstructions.

Not anywhere near correct, I'm afraid, as any glider pilot can tell you.
Thermals also qualify as 'updrafts', and I've spent many hours being
kept aloft by these updrafts.

Understood, but I'm making a distinction between "lift" (which is a
consistent area of "updraft") and "turbulence" (which is an inconsistent
area of "updraft" or varying relative wind, i.e.: wind shear).

The line is fine, admittedly, but the sky is complex enough to require it.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

I'll give you one piece of advice that I have learned by experience. I
fly out of Boulder, CO. West of Boulder is the Continental Divide
rising to 14000+. The prevailing west winds come over the ridge and on
the east side of the ride there is unseen pockets of 'rotor' type
turbulence. Going west you are climbing and are slow, so if you hit
them it's not too bad. But coming east, you are descending. Pilots need
to keep their speed down here. It is easy to point the nose down and
gain speed. Sometimes, except for these turbulence pockets, the route
is smooth, so that doubles the temptation to come down fast. When you
hit the pocket of turbulence it is usually just one or two "thwaps",
like giant hit the top of the wings with a big flyswatter. Then smooth
again. This is one place where keeping an eye on Va is essential.