"Norman" wrote...

snip
The following is an impressive satpic showing what you are
describing,
Martin. It shows the Crozet Islands in the Indian Ocean under a
layer
of Sc. The island on the left does not penetrate through the top of
the
Sc and is producing a ship-type wake. The island on the right is
protruding above the top of the Sc and is producing von Karman
vortices
downstream.

http://www.weather-consultancy.com/s...rozet-ship.jpe

.... that's interesting: what I saw yesterday was the left-hand
structure (though with near-clear skies between the perturbed cloud
rolls), and could not detect the classic VKVs as on the right -
however, they may have been there just not visible in the course-res.
stuff I was looking at. However, as it was unlikely that the highest
part of the ground did not penetrate the Sc sheet, it's perhaps not
surprising.

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023