All the models do incorporate gravity (otherwise less dense air would stay
exactly where it is, and no convection).

They are of course 'models' - a mathemetical description of behaviour if
a variety of assumptions are correct. When I was involved in Met. research
in the 1970's it was clear that the models used then for meso scale (the
scale on which usable convection occurs) gave very poor correlation with
reality. My understanding is that the models today are more refined, but
still are nowhere near matching the complex reality where topographic
effects and a mixture of airmass trajectories have large effects on the
behaviour. Trying to explain observed effects assuming a homogenous
airmass over a uniform surface (or even one varying regularly) are
interesting to mathematicians but almost totally irrelevant to soaring
pilots.

At 01:13 20 December 2008, bagmaker wrote:

snip-
Heus continues, All around the cloud, air sinks downward in
compensation for the upward movement.
-snip

What bunk

Hues should perhaps remind himself of gravity, and that his models dont
seem to take it into account


bagger




--
bagmaker