New HD Video: Cumulus Time Lapse

[Kemp[_2_]]

is at: http://hdsoaring.blogspot.com/

As always, comments are welcome.

Kemp

[[email protected]]

On Apr 28, 4:43*pm, Kemp > wrote:
>
> As always, comments are welcome.


Kemp and Matt,

Thanks to you both for this great video, though the reference to a
pileus cloud forced me to do a Google search where I found (to save
others the effort) the following:

"A layer of cloud sometimes seen capping a cumulus cloud. The pileus
layer forms when the cumulus cloud pushes a moist layer of air above
it upwards, causing condensation in this layer. Eventually, the
cumulus will grow into and penetrate the pileus cloud, after which the
pileus may remain as a cloud skirt around the cumulus."

An even better explanation, along with a nice still picture, was at

http://www.stormeyes.org/tornado/SkyPix/pileus.htm

"Pileus caps are made of ice crystals high in the troposphere. They
form as a slab of air is shoved upward, in the shape of a dome or cap,
just above a rapidly rising convective tower. Moisture in the dome
condenses directly into an ice fog as the air rises and cools, forming
the pileus. Next, the convection shoots right through the pileus
layer. The lifted layer above the convective tower can't be too dry
(must have high humidity), or the pileus cap won't develop."

Thanks again.

Marty
WT