[Met_help] [rt.rap.ucar.edu #62798] History for Choosing the right obs type from prepbufr files
John Halley Gotway via RT
met_help at ucar.edu
Tue Aug 27 14:02:22 MDT 2013
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Hi,
I'm trying to select 10m wind speed from the prepbufr files located in
/glade/p/rda/data/ds337.0/netcdf/tarfiles, specifically the date 20100604.
But after running pb2nc all data left is over the ocean or along the coast
(SFCSHP). Shouldn't I get also the metar and synop data inland? I've tried
looking in different times but the stations are always at the coast/ocean.
I attached the plot I get from plot_point_obs. I know there are several
airports in the region (14 in CT, 35 in MA, 8 in RI and 21 in NJ) and I
wonder if I'm using the wrong configuration in pb2nc.
I have my PB2NCConfig file with the following settings:
message_type = ["ONLYSF"];
station_id = [];
obs_window = {
beg =-21600;
end = 21600;
}
mask = {
poly =
"/glade/p/work/frediani/Validation/gen_poly_mask/wrf_domain_poly.txt";
};
elevation_range = {
beg = -1000;
end = 100000;
}
pb_report_type = [];
in_report_type = [];
instrument_type = [];
level_range = {
beg = 1;
end = 255;
}
level_category = [];
obs_grib_code = ["WIND"];
quality_mark_thresh = 2;
event_stack_flag = TOP;
Can you help me understand if it's a problem with my Config file or the
data? If it's the data, shouldn't it include the metar? Is there another
version of this dataset I could find what I need?
Thanks a lot
Maria Eugenia B. Frediani
-------------------------------------------------------------------------------------
PhD Candidate
University of Connecticut
School of Engineering
261 Glenbrook Rd
Storrs, CT 06269
maria.frediani at uconn.edu
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Choosing the right obs type from prepbufr files
From: John Halley Gotway
Time: Tue Aug 27 11:43:26 2013
Maria,
Sorry for the delay in getting back to you. Since I didn't have your
WRF output file available for testing, I just went through the same
steps you did but using the NAM's grid 218.
You're using NCEP's GDAS PREPBUFR files and there is a rather
unfortunate fact about them. The GDAS data assimilation system
generally assigns all ADPSFC observations a quality marker value of 9.
They've found that assimilating the surface observations results in a
poorer forecast. So they suppress the assimilation of ADPSFC
observations by resetting the quality marker. That's unfortunate
from a verification perspective, but so it goes. I believe that NDAS
data does not have this problem.
There is a note about this at the bottom of this page on the MET
website:
http://www.dtcenter.org/met/users/downloads/observation_data.php
I've attached 2 images to this message showing the location of the
observations with the quality marker set to 2 and 9. As you can see,
for 2 there are no ADPSFC observations, but they do show up for
9. So I'd suggest rerunning with a quality marker of 9 or switching
over to using NDAS PREPBUFR observations.
Hope that helps.
Thanks,
John Halley Gotway
met_help at ucar.edu
On 08/26/2013 10:09 AM, Maria Eugenia via RT wrote:
>
> Mon Aug 26 10:09:06 2013: Request 62798 was acted upon.
> Transaction: Ticket created by maria.frediani at gmail.com
> Queue: met_help
> Subject: Choosing the right obs type from prepbufr files
> Owner: Nobody
> Requestors: maria.frediani at gmail.com
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=62798 >
>
>
> Hi,
>
> I'm trying to select 10m wind speed from the prepbufr files located
in
> /glade/p/rda/data/ds337.0/netcdf/tarfiles, specifically the date
20100604.
>
>
> But after running pb2nc all data left is over the ocean or along the
coast
> (SFCSHP). Shouldn't I get also the metar and synop data inland? I've
tried
> looking in different times but the stations are always at the
coast/ocean.
>
> I attached the plot I get from plot_point_obs. I know there are
several
> airports in the region (14 in CT, 35 in MA, 8 in RI and 21 in NJ)
and I
> wonder if I'm using the wrong configuration in pb2nc.
>
> I have my PB2NCConfig file with the following settings:
>
> message_type = ["ONLYSF"];
> station_id = [];
> obs_window = {
> beg =-21600;
> end = 21600;
> }
> mask = {
> poly =
>
"/glade/p/work/frediani/Validation/gen_poly_mask/wrf_domain_poly.txt";
> };
> elevation_range = {
> beg = -1000;
> end = 100000;
> }
> pb_report_type = [];
> in_report_type = [];
> instrument_type = [];
> level_range = {
> beg = 1;
> end = 255;
> }
> level_category = [];
> obs_grib_code = ["WIND"];
> quality_mark_thresh = 2;
> event_stack_flag = TOP;
>
>
> Can you help me understand if it's a problem with my Config file or
the
> data? If it's the data, shouldn't it include the metar? Is there
another
> version of this dataset I could find what I need?
>
> Thanks a lot
>
> Maria Eugenia B. Frediani
>
-------------------------------------------------------------------------------------
> PhD Candidate
> University of Connecticut
> School of Engineering
> 261 Glenbrook Rd
> Storrs, CT 06269
> maria.frediani at uconn.edu
>
------------------------------------------------
Subject: Choosing the right obs type from prepbufr files
From: Maria Eugenia
Time: Tue Aug 27 13:56:19 2013
Hi John,
Once more you save my research! Thanks a lot!
Maria Eugenia B. Frediani
-------------------------------------------------------------------------------------
PhD Candidate
University of Connecticut
School of Engineering
261 Glenbrook Rd
Storrs, CT 06269
maria.frediani at uconn.edu
On Tue, Aug 27, 2013 at 11:43 AM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Maria,
>
> Sorry for the delay in getting back to you. Since I didn't have
your WRF
> output file available for testing, I just went through the same
steps you
> did but using the NAM's grid 218.
>
> You're using NCEP's GDAS PREPBUFR files and there is a rather
unfortunate
> fact about them. The GDAS data assimilation system generally
assigns all
> ADPSFC observations a quality marker value of 9.
> They've found that assimilating the surface observations results in
a
> poorer forecast. So they suppress the assimilation of ADPSFC
observations
> by resetting the quality marker. That's unfortunate
> from a verification perspective, but so it goes. I believe that
NDAS data
> does not have this problem.
>
> There is a note about this at the bottom of this page on the MET
website:
> http://www.dtcenter.org/met/users/downloads/observation_data.php
>
> I've attached 2 images to this message showing the location of the
> observations with the quality marker set to 2 and 9. As you can
see, for 2
> there are no ADPSFC observations, but they do show up for
> 9. So I'd suggest rerunning with a quality marker of 9 or switching
over
> to using NDAS PREPBUFR observations.
>
> Hope that helps.
>
> Thanks,
> John Halley Gotway
> met_help at ucar.edu
>
> On 08/26/2013 10:09 AM, Maria Eugenia via RT wrote:
> >
> > Mon Aug 26 10:09:06 2013: Request 62798 was acted upon.
> > Transaction: Ticket created by maria.frediani at gmail.com
> > Queue: met_help
> > Subject: Choosing the right obs type from prepbufr files
> > Owner: Nobody
> > Requestors: maria.frediani at gmail.com
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=62798 >
> >
> >
> > Hi,
> >
> > I'm trying to select 10m wind speed from the prepbufr files
located in
> > /glade/p/rda/data/ds337.0/netcdf/tarfiles, specifically the date
> 20100604.
> >
> >
> > But after running pb2nc all data left is over the ocean or along
the
> coast
> > (SFCSHP). Shouldn't I get also the metar and synop data inland?
I've
> tried
> > looking in different times but the stations are always at the
> coast/ocean.
> >
> > I attached the plot I get from plot_point_obs. I know there are
several
> > airports in the region (14 in CT, 35 in MA, 8 in RI and 21 in NJ)
and I
> > wonder if I'm using the wrong configuration in pb2nc.
> >
> > I have my PB2NCConfig file with the following settings:
> >
> > message_type = ["ONLYSF"];
> > station_id = [];
> > obs_window = {
> > beg =-21600;
> > end = 21600;
> > }
> > mask = {
> > poly =
> >
"/glade/p/work/frediani/Validation/gen_poly_mask/wrf_domain_poly.txt";
> > };
> > elevation_range = {
> > beg = -1000;
> > end = 100000;
> > }
> > pb_report_type = [];
> > in_report_type = [];
> > instrument_type = [];
> > level_range = {
> > beg = 1;
> > end = 255;
> > }
> > level_category = [];
> > obs_grib_code = ["WIND"];
> > quality_mark_thresh = 2;
> > event_stack_flag = TOP;
> >
> >
> > Can you help me understand if it's a problem with my Config file
or the
> > data? If it's the data, shouldn't it include the metar? Is there
another
> > version of this dataset I could find what I need?
> >
> > Thanks a lot
> >
> > Maria Eugenia B. Frediani
> >
>
-------------------------------------------------------------------------------------
> > PhD Candidate
> > University of Connecticut
> > School of Engineering
> > 261 Glenbrook Rd
> > Storrs, CT 06269
> > maria.frediani at uconn.edu
> >
>
>
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