| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030630.3 | SGP/RUC/X1 - 00z and 12z files missing raob data | sgpallruc20hybrX1.00, sgpallruc20hybrX1.c1, sgpallruc20isobX1.00, sgpallruc20isobX1.c1, sgpruc20hybrX1.c1, sgpruc20isobX1.c1, sgpsynruc20isobX1.c1 |
| D060209.2 | SGP/RUC/X1 - Subsetting RUC-40 | sgpallruc40hybrX1.c1, sgpallruc40isobX1.c1 |
| D060209.3 | SGP/RUC/X1 - Subsetting RUC-40 | sgpallruc40isobX1.c1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/18/2002 | 1200 | 02/04/2003 | 2359 |
| Subject: | SGP/RUC/X1 - 00z and 12z files missing raob data |
| DataStreams: | sgpallruc20hybrX1.00, sgpallruc20hybrX1.c1, sgpallruc20isobX1.00, sgpallruc20isobX1.c1, sgpruc20hybrX1.c1, sgpruc20isobX1.c1, sgpsynruc20isobX1.c1 |
| Description: | The RUC 20 analyses files for hours 00z and 12z may be missing raob data between 04/18/2002-02/04/2003. This affects datastreams sgpallruc20isobX1.00, sgpallruc20isobX1.c1, sgpruc20isobX1.c1, sgpsynruc20isobX1.c1. sgpallruc20hybrX1.00, sgpallruc20hybrX1.c1, and sgpruc20hybrX1.c1. The situation was that we were picking up all data from the ruc2a directory from NCEP's ftp server. Apparently, the 00z and 12z files in this directory are "early look" "A" analysis files which miss most of the raob data. Starting on 2/5/03, we started to pick up the 00z and 12z files from the second "B" analysis from the ruc2b directory. Only data for hours 00z and 12z are affected. Below are exerpts from Stan Benjamin of FSL regarding this problem and how it affects the data. Stan Benjamin in reply to a question on how the data is affected: Feb 19 15:16:11 2003 " ... In your second question, the fields from the A analyses will not be drastically in error. The quality for the near-surface grids would be about equal to that of the B analysis. The wind conditions aloft would be slightly degraded but not much. The fields with the most degradation would be the details of the vertical profiles of humidity and, to a lesser extent, temperature..." General message from Stan Benjamin (Feb 3, 2003): "... Basically, the problem is that unless you've taken special precautions in your ftp scripts, you've been accessing RUC analyses at 0000 and 1200 UTC that do not assimilate most of the raob data. Let me explain: There are 2 RUC analyses in the operational NCEP version at 00z and 12z only. The first is an "early look" analysis, called the "A" analysis that misses most of the raob data (although it does have most of the other obs in it - profiler, aircraft, sfc, etc.). The 00z and 12z RUC forecasts do NOT run off the "A" analysis. Instead, a second analysis called the "B" analysis with a later (30 min) data cut-off to catch raob data is run, and then the forecast is run. At the NCEP ftp site, the ruc2a directories contain the "A" analyses and forecasts initialized from the "B" analysis. Yes, a little confusing. To obtain the "B" analyses, you must go to the corresponding ruc2b directory. In other words, you must access two different directories to obtain the best RUC analysis and forecast (from the B run) at 0000 and 1200 UTC. Again, there is no B run at times other than 0000 and 1200 UTC. The information on the RUC web site about ftp'ing from the NCEP-ftp site was NOT correct about this issue until this afternoon. It is now corrected (see http://ruc.fsl.noaa.gov/ruc20.data-access.html). ..." |
| Measurements: | sgpruc20hybrX1.c1:
sgpallruc20hybrX1.c1:
sgpsynruc20isobX1.c1:
sgpallruc20hybrX1.00:
sgpallruc20isobX1.c1:
sgpallruc20isobX1.00:
sgpruc20isobX1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/05/1998 | 0000 | 04/16/2002 | 2359 |
| Subject: | SGP/RUC/X1 - Subsetting RUC-40 |
| DataStreams: | sgpallruc40hybrX1.c1, sgpallruc40isobX1.c1 |
| Description: | Users who would like access to subsetted RUC-40 data products similar to those products currently available for RUC-20 can use NCO utilities to create subsets from the "sgpallruc40" data products. Below is one method that can be used. This is also mentioned in the FAQ on the ARM RUC description page at: http://www.arm.gov/xds/static/ruc.stm -------------------------------------------------------------- Question: How can I create subsetted RUC 40 data similar to the RUC 20 data currently available at the Archive? Currently, the RUC 40 netCDF data available at the archive are the full area, hourly files (sgpallruc40isobX1.c1 and sgpallruc40hybrX1.c1). Using the netCDF Operator (NCO) utilities, it is easy to produce subsetted, daily files similar to the RUC 20 subsets available (sgpruc20hybrX1.c1 and sgpruc20isobX1.c1). The NCO utilities can be found at http://nco.sourceforge.net/ Using the ncks (NCO "kitchen sink") command, you can subset the ruc data as follows: ncks -d nx, |
| Measurements: | sgpallruc40isobX1.c1:
sgpallruc40hybrX1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/20/1998 | 0000 | 04/16/2002 | 2359 |
| Subject: | SGP/RUC/X1 - Subsetting RUC-40 |
| DataStreams: | sgpallruc40isobX1.c1 |
| Description: | As per ECR-00405, some users would to have access to subsetted RUC-40 data products similar to those products currently available for RUC-20. |
| Measurements: | sgpallruc40isobX1.c1:
|