Daytime maxes below freezing?
 

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

Daytime maxes below freezing?
 

In article ,
Jeremy Handscomb writes:
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?

No.

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?

In this case, I think it's just that they are further from the sea.
--
John Hall

"The covers of this book are too far apart."
Ambrose Bierce (1842-1914)

Daytime maxes below freezing?
 

"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

Daytime maxes below freezing?
 

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

Daytime maxes below freezing?
 

"Jeremy Handscomb" wrote in message
...
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

Hi Jeremy,

It isi nteresting to note that this airmass has advected into SE parts,
hence the colder day here. The sounding at 11Z at 03882 (Herstmonceux)
shows one similar to the one I posted before but slightly modified, due to
the 12 degC English Channel it has passed over -

http://weather.uwyo.edu/cgi-bin/soun...212&STNM=03882

Joe