[Met_help] [rt.rap.ucar.edu #78559] History for Evaluation of Radiation fields with NARR
John Halley Gotway via RT
met_help at ucar.edu
Thu Nov 3 09:35:15 MDT 2016
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Dear MET staff,
I hope you are doing well at your end.
I am planning to evaluate hourly WRF model outputs of surface radiation
fields using NARR files from ftp://nomads.ncdc.noaa.gov/NARR.
I would like to ask for your suggestions/advice on the following:
1) the "A" NARR files from the above source have 3hr-average of surface
radiation fields, meaning I need the corresponding average from the WRF
files. I'd like to know if there is a way/software to compute the 3 hr
average using the converted WRF GRIB files with UPP, instead of the
original netcdf WRF files ?? , If so, do you have an example ??
2) the "B" NARR files have a 3hr forecast (first guess) surface radiation
field. Is it correct to use them to verify instantaneous WRF files at 09 12
... 21 Z ??.
As a note, I already converted wrf grid to NARR grid and used grid-stat on
Temperature fields.
Thanks in advance for your time,
Best regards
Victor
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Evaluation of Radiation fields with NARR
From: John Halley Gotway
Time: Wed Nov 02 10:24:26 2016
Hello Victor,
I see that you have a question about how to post-processing your WRF
output
in a way to make it comparable with the NARR analysis files.
Unfortunately, I'm not an expert on UPP so I'm probably not the best
person
to help you with this issue. I do see in the UPP documentation that
it's
possible to compute both instantaneous and time averaged radiation
fields.
However, I don't know how that time average is defined.
I'd suggest that you resend this question to wrfhelp at ucar.edu and
indicate
that it's a UPP question. I talk the person who provides UPP support
and
let her know that you'll be writing.
For the perspective of MET though, if you have 3 fields of numbers and
you
want to compute their average, you could run them through the
Ensemble-Stat
tool and compute an "ensemble mean" field. That's somewhat clumsy,
but
that'd be one way to get to what you're after.
The pcp_combine tool in MET can be used to "add" and "subtract" fields
of
numbers. It would be pretty easy to extend that functionality to also
compute a mean field or some percentile. Do you think that'd be a
useful
addition for a future release?
Thanks,
John
On Tue, Nov 1, 2016 at 4:33 PM, Victor Almanza via RT
<met_help at ucar.edu>
wrote:
>
> Tue Nov 01 16:33:41 2016: Request 78559 was acted upon.
> Transaction: Ticket created by victor.al.vlz at gmail.com
> Queue: met_help
> Subject: Evaluation of Radiation fields with NARR
> Owner: Nobody
> Requestors: victor.al.vlz at gmail.com
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78559 >
>
>
> Dear MET staff,
>
> I hope you are doing well at your end.
>
> I am planning to evaluate hourly WRF model outputs of surface
radiation
> fields using NARR files from ftp://nomads.ncdc.noaa.gov/NARR.
>
> I would like to ask for your suggestions/advice on the following:
>
> 1) the "A" NARR files from the above source have 3hr-average of
surface
> radiation fields, meaning I need the corresponding average from the
WRF
> files. I'd like to know if there is a way/software to compute the 3
hr
> average using the converted WRF GRIB files with UPP, instead of the
> original netcdf WRF files ?? , If so, do you have an example ??
>
> 2) the "B" NARR files have a 3hr forecast (first guess) surface
radiation
> field. Is it correct to use them to verify instantaneous WRF files
at 09 12
> ... 21 Z ??.
>
> As a note, I already converted wrf grid to NARR grid and used grid-
stat on
> Temperature fields.
>
> Thanks in advance for your time,
>
> Best regards
>
> Victor
>
>
------------------------------------------------
Subject: Evaluation of Radiation fields with NARR
From: Victor Almanza
Time: Wed Nov 02 13:14:16 2016
Dear John,
Thank you for your help and support with this question. I'll write to
wrfhelp as you suggest.
In the meantime, I will try the Ensemble-Stat.
Do you know if there is something similar to "NCO" operators but for
grib
files ??
I read that wgrib2 can compute averages, and that "lats4d" could do
that,
but I've never tried them before.
As for pcp_combine, I think that sometimes it is easier to handle
small-size files, especially when dealing with high-resolution
domains,
long simulation times (months, years) and several configurations.
Depending
on the evaluation objectives, it is likely one would need to use
average
observation data for some variables and different periods. Even though
we
can post-process netcdf files and compute averages, etc with the model
outputs; disk space is, most of the times, a factor to take into
account.
So, if doing part of the post-processing directly with MET can be
useful to
the MET users community, maybe pcp_combine could be extended with that
feature.
Again, thanks in advance for your time
Best regards
Victor
On Wed, Nov 2, 2016 at 9:24 AM, John Halley Gotway via RT
<met_help at ucar.edu
> wrote:
> Hello Victor,
>
> I see that you have a question about how to post-processing your WRF
output
> in a way to make it comparable with the NARR analysis files.
>
> Unfortunately, I'm not an expert on UPP so I'm probably not the best
person
> to help you with this issue. I do see in the UPP documentation that
it's
> possible to compute both instantaneous and time averaged radiation
fields.
> However, I don't know how that time average is defined.
>
> I'd suggest that you resend this question to wrfhelp at ucar.edu and
indicate
> that it's a UPP question. I talk the person who provides UPP
support and
> let her know that you'll be writing.
>
> For the perspective of MET though, if you have 3 fields of numbers
and you
> want to compute their average, you could run them through the
Ensemble-Stat
> tool and compute an "ensemble mean" field. That's somewhat clumsy,
but
> that'd be one way to get to what you're after.
>
> The pcp_combine tool in MET can be used to "add" and "subtract"
fields of
> numbers. It would be pretty easy to extend that functionality to
also
> compute a mean field or some percentile. Do you think that'd be a
useful
> addition for a future release?
>
> Thanks,
> John
>
>
>
> On Tue, Nov 1, 2016 at 4:33 PM, Victor Almanza via RT
<met_help at ucar.edu>
> wrote:
>
> >
> > Tue Nov 01 16:33:41 2016: Request 78559 was acted upon.
> > Transaction: Ticket created by victor.al.vlz at gmail.com
> > Queue: met_help
> > Subject: Evaluation of Radiation fields with NARR
> > Owner: Nobody
> > Requestors: victor.al.vlz at gmail.com
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78559 >
> >
> >
> > Dear MET staff,
> >
> > I hope you are doing well at your end.
> >
> > I am planning to evaluate hourly WRF model outputs of surface
radiation
> > fields using NARR files from ftp://nomads.ncdc.noaa.gov/NARR.
> >
> > I would like to ask for your suggestions/advice on the following:
> >
> > 1) the "A" NARR files from the above source have 3hr-average of
surface
> > radiation fields, meaning I need the corresponding average from
the WRF
> > files. I'd like to know if there is a way/software to compute the
3 hr
> > average using the converted WRF GRIB files with UPP, instead of
the
> > original netcdf WRF files ?? , If so, do you have an example ??
> >
> > 2) the "B" NARR files have a 3hr forecast (first guess) surface
radiation
> > field. Is it correct to use them to verify instantaneous WRF files
at 09
> 12
> > ... 21 Z ??.
> >
> > As a note, I already converted wrf grid to NARR grid and used
grid-stat
> on
> > Temperature fields.
> >
> > Thanks in advance for your time,
> >
> > Best regards
> >
> > Victor
> >
> >
>
>
------------------------------------------------
Subject: Evaluation of Radiation fields with NARR
From: John Halley Gotway
Time: Wed Nov 02 13:54:25 2016
Victor,
My apologies... please write upp-help at ucar.edu, not wrfhelp at ucar.edu.
That'll go directly to the write person.
Here's an option. To compute an "average" of GRIB data you could...
(1) Use UPP to create GRIB2 output files.
(2) Use the wgrib2 utility to compute an a mean of 3 1-hourly files.
But the UPP support staff should be able to help you find out if
there's a
way of doing time-averaging of surface radiation directly.
John
On Wed, Nov 2, 2016 at 1:14 PM, Victor Almanza via RT
<met_help at ucar.edu>
wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78559 >
>
> Dear John,
>
> Thank you for your help and support with this question. I'll write
to
> wrfhelp as you suggest.
>
> In the meantime, I will try the Ensemble-Stat.
>
> Do you know if there is something similar to "NCO" operators but for
grib
> files ??
>
> I read that wgrib2 can compute averages, and that "lats4d" could do
that,
> but I've never tried them before.
>
> As for pcp_combine, I think that sometimes it is easier to handle
> small-size files, especially when dealing with high-resolution
domains,
> long simulation times (months, years) and several configurations.
Depending
> on the evaluation objectives, it is likely one would need to use
average
> observation data for some variables and different periods. Even
though we
> can post-process netcdf files and compute averages, etc with the
model
> outputs; disk space is, most of the times, a factor to take into
account.
> So, if doing part of the post-processing directly with MET can be
useful to
> the MET users community, maybe pcp_combine could be extended with
that
> feature.
>
> Again, thanks in advance for your time
>
> Best regards
>
> Victor
>
>
> On Wed, Nov 2, 2016 at 9:24 AM, John Halley Gotway via RT <
> met_help at ucar.edu
> > wrote:
>
> > Hello Victor,
> >
> > I see that you have a question about how to post-processing your
WRF
> output
> > in a way to make it comparable with the NARR analysis files.
> >
> > Unfortunately, I'm not an expert on UPP so I'm probably not the
best
> person
> > to help you with this issue. I do see in the UPP documentation
that it's
> > possible to compute both instantaneous and time averaged radiation
> fields.
> > However, I don't know how that time average is defined.
> >
> > I'd suggest that you resend this question to wrfhelp at ucar.edu and
> indicate
> > that it's a UPP question. I talk the person who provides UPP
support and
> > let her know that you'll be writing.
> >
> > For the perspective of MET though, if you have 3 fields of numbers
and
> you
> > want to compute their average, you could run them through the
> Ensemble-Stat
> > tool and compute an "ensemble mean" field. That's somewhat
clumsy, but
> > that'd be one way to get to what you're after.
> >
> > The pcp_combine tool in MET can be used to "add" and "subtract"
fields of
> > numbers. It would be pretty easy to extend that functionality to
also
> > compute a mean field or some percentile. Do you think that'd be a
useful
> > addition for a future release?
> >
> > Thanks,
> > John
> >
> >
> >
> > On Tue, Nov 1, 2016 at 4:33 PM, Victor Almanza via RT
<met_help at ucar.edu
> >
> > wrote:
> >
> > >
> > > Tue Nov 01 16:33:41 2016: Request 78559 was acted upon.
> > > Transaction: Ticket created by victor.al.vlz at gmail.com
> > > Queue: met_help
> > > Subject: Evaluation of Radiation fields with NARR
> > > Owner: Nobody
> > > Requestors: victor.al.vlz at gmail.com
> > > Status: new
> > > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78559
> >
> > >
> > >
> > > Dear MET staff,
> > >
> > > I hope you are doing well at your end.
> > >
> > > I am planning to evaluate hourly WRF model outputs of surface
radiation
> > > fields using NARR files from ftp://nomads.ncdc.noaa.gov/NARR.
> > >
> > > I would like to ask for your suggestions/advice on the
following:
> > >
> > > 1) the "A" NARR files from the above source have 3hr-average of
surface
> > > radiation fields, meaning I need the corresponding average from
the WRF
> > > files. I'd like to know if there is a way/software to compute
the 3 hr
> > > average using the converted WRF GRIB files with UPP, instead of
the
> > > original netcdf WRF files ?? , If so, do you have an example ??
> > >
> > > 2) the "B" NARR files have a 3hr forecast (first guess) surface
> radiation
> > > field. Is it correct to use them to verify instantaneous WRF
files at
> 09
> > 12
> > > ... 21 Z ??.
> > >
> > > As a note, I already converted wrf grid to NARR grid and used
grid-stat
> > on
> > > Temperature fields.
> > >
> > > Thanks in advance for your time,
> > >
> > > Best regards
> > >
> > > Victor
> > >
> > >
> >
> >
>
>
------------------------------------------------
Subject: Evaluation of Radiation fields with NARR
From: Victor Almanza
Time: Wed Nov 02 18:06:56 2016
Dear John,
Thanks again for your time and help. I will write to the new email
address.
In either case, let me try your hints.
Best regards
Victor
On Wed, Nov 2, 2016 at 12:54 PM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Victor,
>
> My apologies... please write upp-help at ucar.edu, not
wrfhelp at ucar.edu.
> That'll go directly to the write person.
>
> Here's an option. To compute an "average" of GRIB data you could...
> (1) Use UPP to create GRIB2 output files.
> (2) Use the wgrib2 utility to compute an a mean of 3 1-hourly files.
>
> But the UPP support staff should be able to help you find out if
there's a
> way of doing time-averaging of surface radiation directly.
>
> John
>
> On Wed, Nov 2, 2016 at 1:14 PM, Victor Almanza via RT
<met_help at ucar.edu>
> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=78559 >
> >
> > Dear John,
> >
> > Thank you for your help and support with this question. I'll write
to
> > wrfhelp as you suggest.
> >
> > In the meantime, I will try the Ensemble-Stat.
> >
> > Do you know if there is something similar to "NCO" operators but
for grib
> > files ??
> >
> > I read that wgrib2 can compute averages, and that "lats4d" could
do that,
> > but I've never tried them before.
> >
> > As for pcp_combine, I think that sometimes it is easier to handle
> > small-size files, especially when dealing with high-resolution
domains,
> > long simulation times (months, years) and several configurations.
> Depending
> > on the evaluation objectives, it is likely one would need to use
average
> > observation data for some variables and different periods. Even
though we
> > can post-process netcdf files and compute averages, etc with the
model
> > outputs; disk space is, most of the times, a factor to take into
account.
> > So, if doing part of the post-processing directly with MET can be
useful
> to
> > the MET users community, maybe pcp_combine could be extended with
that
> > feature.
> >
> > Again, thanks in advance for your time
> >
> > Best regards
> >
> > Victor
> >
> >
> > On Wed, Nov 2, 2016 at 9:24 AM, John Halley Gotway via RT <
> > met_help at ucar.edu
> > > wrote:
> >
> > > Hello Victor,
> > >
> > > I see that you have a question about how to post-processing your
WRF
> > output
> > > in a way to make it comparable with the NARR analysis files.
> > >
> > > Unfortunately, I'm not an expert on UPP so I'm probably not the
best
> > person
> > > to help you with this issue. I do see in the UPP documentation
that
> it's
> > > possible to compute both instantaneous and time averaged
radiation
> > fields.
> > > However, I don't know how that time average is defined.
> > >
> > > I'd suggest that you resend this question to wrfhelp at ucar.edu
and
> > indicate
> > > that it's a UPP question. I talk the person who provides UPP
support
> and
> > > let her know that you'll be writing.
> > >
> > > For the perspective of MET though, if you have 3 fields of
numbers and
> > you
> > > want to compute their average, you could run them through the
> > Ensemble-Stat
> > > tool and compute an "ensemble mean" field. That's somewhat
clumsy, but
> > > that'd be one way to get to what you're after.
> > >
> > > The pcp_combine tool in MET can be used to "add" and "subtract"
fields
> of
> > > numbers. It would be pretty easy to extend that functionality
to also
> > > compute a mean field or some percentile. Do you think that'd be
a
> useful
> > > addition for a future release?
> > >
> > > Thanks,
> > > John
> > >
> > >
> > >
> > > On Tue, Nov 1, 2016 at 4:33 PM, Victor Almanza via RT <
> met_help at ucar.edu
> > >
> > > wrote:
> > >
> > > >
> > > > Tue Nov 01 16:33:41 2016: Request 78559 was acted upon.
> > > > Transaction: Ticket created by victor.al.vlz at gmail.com
> > > > Queue: met_help
> > > > Subject: Evaluation of Radiation fields with NARR
> > > > Owner: Nobody
> > > > Requestors: victor.al.vlz at gmail.com
> > > > Status: new
> > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> Ticket/Display.html?id=78559
> > >
> > > >
> > > >
> > > > Dear MET staff,
> > > >
> > > > I hope you are doing well at your end.
> > > >
> > > > I am planning to evaluate hourly WRF model outputs of surface
> radiation
> > > > fields using NARR files from ftp://nomads.ncdc.noaa.gov/NARR.
> > > >
> > > > I would like to ask for your suggestions/advice on the
following:
> > > >
> > > > 1) the "A" NARR files from the above source have 3hr-average
of
> surface
> > > > radiation fields, meaning I need the corresponding average
from the
> WRF
> > > > files. I'd like to know if there is a way/software to compute
the 3
> hr
> > > > average using the converted WRF GRIB files with UPP, instead
of the
> > > > original netcdf WRF files ?? , If so, do you have an example
??
> > > >
> > > > 2) the "B" NARR files have a 3hr forecast (first guess)
surface
> > radiation
> > > > field. Is it correct to use them to verify instantaneous WRF
files at
> > 09
> > > 12
> > > > ... 21 Z ??.
> > > >
> > > > As a note, I already converted wrf grid to NARR grid and used
> grid-stat
> > > on
> > > > Temperature fields.
> > > >
> > > > Thanks in advance for your time,
> > > >
> > > > Best regards
> > > >
> > > > Victor
> > > >
> > > >
> > >
> > >
> >
> >
>
>
------------------------------------------------
More information about the Met_help
mailing list