Ode Coyote wrote:

>  This and All the other photos show a sky with conditions conducive to
> cloud formation and with the heaviest contrials being near in or under the
> already formed clouds.  Just add a little vapor and turbulance  to an
> unstable [but as yet invisible] boundary area and you get clouds. Fly out
> of that boundary area and...no clouds.  Fly into another and get clouds again.
>  Vast sections of sky can be conducive to cloud formation and still appear
> quite clear. All it takes is just a little more water vapor to make a cloud
> there.

This is the opposite of what I usually see.  You get the trail when they are in
blue sky, but the trail turns off usually just before entering a cloud, and does
not turn back on till they are back in blue sky.

The trails are in blue sky, almost never near or in the clouds.

Now for contrails, I do see the trails get denser when they fly into clouds, or
near clouds.  The effect is just the opposite.  But it is easy to tell these 
type
of trails usually, they dissipate in a matter of seconds usually and minutes at
the most.  They never make it to the ground like the others do.

Marshall


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