Thanks for that info, it's very interesting to see such a strong inversion
in the ascents. I never realized that radiative cooling could have such a
strong effect!

Jeremy

"Joe Hunt" wrote in message
...

"Jeremy Handscomb" wrote in message
...
Hi all,

Have noticed that the continent are having some highs that are below
freezing at the moment, underneath this beast of an anticyclone. Is this
unusual? Strasbourg for example was recording -1 C at 14Z yesterday. Is
it
due to freezing fog? Why do they cool so much under high pressure and we
don't? Is it really just the influence of the seas or does their cool
air
have a source?

Thanks,

Jeremy

Hi Jeremy,
http://weather.noaa.gov/weather/current/LFSX.html shows mist rather than
any fog.

The nearest sounding to Strasbourg at 11Z yesterday, ETGI (Idar), shows a
very strong subsidence inversion, a result of the vertically stacked high
pressure block -
http://weather.uwyo.edu/cgi-bin/soun...Idar-Oberstein

Strong radiative cooling over successive nights and little or no boundary
layer stirring through turbulence leads to such cold conditions. However,
if you were at the top of one of the hills/mountains in Les Vosges (900m
asl let's say) then you'd have been basking in clear blue skies, an air
temperature of 10 degC and remarkably dry air with a dew point of MS38
degC.

Joe