I have had a quick look at the ascents, Tudor, what few are available. There
may have been a minimal fohn effect, but the ascent for Nimes (07645) for
midday on 12th, and that for Payerne (06610), suggest that the air below the
subsidence inversion was just heated by insolation, and as one might expect
from the high wind speeds and resultant turbulent mixing, this gave a dry
adiabatic lapse from the surface to 770 mbar. The upwind ascent at Payerne
had a moist layer just below the subsidence inversion, but a much deeper
moist layer would be required for any substantial fone effect. With such
high wind speeds though, there was likely some entrainment of air into the
boundary layer from above the subsidence inversion, and this too would
contribute to the observed surface temperatures.

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:
www.woksat.info/wwp.html

"Tudor Hughes" wrote in message
...
On Oct 12, 4:35 pm, "Bernard Burton" b.j.burton-
wrote:
Tudor, here is an image from this afternoon's noaa19 pass showing the
roughened sea due to the mistral (sun glint effect). Note the longer
wavelength waves imposed on the sea surface, presumably due to orographic
waves embedded in the flow

http://www.woksat.info/etcrj12/rj12-1258-j-fr-s.html

--
Bernard Burton
Wokingham, Berkshire, UK.

Satellite images at:www.woksat.info/wwp.html

"Tudor Hughes" wrote in message

...





http://weather.noaa.gov/weather/current/LFML.html

That's the Mistral for you.

Tudor Hughes, Warlingham, Surrey- Hide quoted text -

- Show quoted text -

Thanks for that, Bernard. It was all a bit dark and I couldn't
see the roughness but the long-wave disturbance was there.
Another point worth making is the Mistral is often referred to
as a cold wind but I have found from monitoring it for a few years
that even for a warm place like Marseille this is not really true
though it may feel a bit like it, the dryness adding to the effect.
Could this warmth be due to a slight föhn effect?

Tudor Hughes, Warlingham, Surrey.