"Colin Youngs" wrote in message
...
Martin Rowley wrote in message ...
:Can anyone tell me how the field which I interpret to be boundary
layer
snip
Under the charts it simply says:
"Boundary layer cloud fraction [%] Isopleths for 5, 10, 30, 60 and
95%"
"Low cloud [%] Isopleths ... "

Is there an explanation in German somewhere else that you can't read ?

.... there doesn't *appear* to be a reference on the wetter3 (
http://www2.wetter3.de/ ) site to this particular field, and I've looked
at the NCEP/EMC site ( http://www.emc.ncep.noaa.gov/ ) and the product,
as far as I can tell, isn't discussed.
I was hoping that someone might have worked with this output and could
point me to something that would give a clue to the answer. As Philip
writes, the boundary-layer output is certainly tuned to quite a
low-level (sub 900m at least and somewhere around 300m is sensible), but
I would like to know *how* they discriminate the low-cloud and boundary
layer output for our purposes, especially over high ground/mountain
areas. Also, is it an integration over a defined altitude band (e.g. for
the boundary layer, would that be an integration from model surface to
model 600m centred on 300m, or is it explicitly centred *on* 300m? For
the low cloud, is it integrated across a layer from, say 300 m to 800 m,
or simply using a single model level *at* 925 hPa etc., etc?

Martin.



Martin.