Dear Igor and John,
This is the interpretation that I'm doing about the monthly average
datasets from the CFS:
http://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/para/cfs/cfs.20110309/00/monthly_grib_01/flxf.01.2011030900.201103.avrg.grib.06Z.grb2
after reading the Operational CFS doc:
http://cfs.ncep.noaa.gov/menu/doc/
in my opinion is that the average is for the 201103 month, and precisely
for the interval:
[2011-03-09, 2011-03-31]
Antonio
--
Antonio S. Cofiño
Grupo de Meteorología de Santander
Dep. de Matemática Aplicada y
Ciencias de la Computación
Universidad de Cantabria
Escuela de Caminos
Avenida de los Castros, 44
39005 Santander, Spain
Tel: (+34) 942 20 1731
Fax: (+34) 942 20 1703
http://www.meteo.unican.es
mailto:antonio.cofino@xxxxxxxxx
El 13/03/2011 15:40, John Caron escribió:
Hi Igor:
So the practical question is whether the data in the file represents a
monthly average in the interval [2011-02-09, 2011-03-09] or
[2011-03-09, 2011-04-09] .
My interpretation is the former; i interpret this in the Id section:
RefTimeSignif = Start of forecast
RefTime = 2011-03-09T00:00:00Z
as saying that was the point in the forecast run when this data was
written out. A forecast run could only average times it has already
computed, so it couldnt be into the future. One could argue that
RefTimeSignif is wrong or misleading.
i assume its probably important to your science to get this right. it
would be great if you could track this down from the originators and
report what the actual meaning is.
Its unfortunate that for all the work put into GRIB, these ambiguities
still exist. Ive recently been arguing that a reference implementation
of GRIB is needed so that there is an authoritative answer for both
readers and writers of GRIB. If anyone is interested, please have a
look at
http://www.unidata.ucar.edu/staff/caron/bufr/Summary.html
On 3/12/2011 10:15 PM, Oleynikov Igor Sergeevich wrote:
Hi John!
I think that date in section 1 more important then date in PDS
section. In
my mind date of start of forecast is 2011-03-09. The end date of
averaging
is 2011-04-09. And of course it is an error into this dataset. I have
just
started working with these data. I will write a solution to this problem
when I do it.
Best regards,
Igor
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