"Will Hand" wrote...
snip


Hi Martin, another thought, do you remember Von Karman vortices?
They are sometimes seen where the Azores interrupts a stable flow.


.... thanks for that Will - yes, that was something that did cross my
mind, but without more data can't really say: must dig out more info
on same to see if I can pin it down - I'm sure that the mechanism must
be of that ilk: what impressed me was that 'effect' as of a ship
ploughing a wake through a calm ocean - or perhaps a submarine's
conning tower doing the same thing to keep the scale correct. It must
have made a dramatic difference to those folk downwind as between OVC
SC (ST) & -DZ and bright sunshine.

I'm sure we had a small element of it here - we stayed resolutely OVC
until 15Z, with morning drizzle, but not too far away in north Dorset,
there seemed to be better breaks between the elements of the Sc len.

Martin.

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