On Fri, 14 Oct 2011 08:25:12 -0700 (PDT), Len Wood
wrote:
usually the cloud streets are pretty straight in an easterly down
the channel.
Yeah, they would be in a more homogeneous airstream than that which
we have today.

It would be difficult to be sure of any rotation as there are no
surface or boundary layer top obs at this resolution.
I did have a brief look at surface obs, but as you say the placing
between them was a bit too wide to pick up any signs. I paid far more
attention, though, to the hi-res visible satellite picture sequence.
The timestep in the sequence was 15 min, which I think is fine enough
to enable rotation to be observed. I couldn't see any.

I was wondering if the Normandy peninsula played any role, but there
seems curvature before it reaches this region.
Yes, I agree, the shape of the coastline probably influenced the
shape of the cloud - or, more accurately, influenced the low-level
humidity distribution.

--
Freddie
Bayston Hill
Shropshire
102m AMSL
http://www.hosiene.co.uk/weather/cumulus/