QCMS Subjective Intervention Lists

To view the subjective intervention lists currently in use at ESRL/GSD, click here: reject, accept.

To view the subjective intervention lists recommended for use in AWIPS, click here: reject, accept.

Note that the recommended AWIPS reject list also includes entries that have been created by the statistical spatial consistency check run at ESRL/GSD using all MADIS mesonet stations, as well as the national surface datasets such as ASOS and maritime. This QC check, introduced at ESRL/GSD in late 2006, will be incorporated in AWIPS build OB8.2. The check was added to improve the accuracy of the observational error estimates, and to reduce the probability of clusters of bad stations degrading the QC results in general. Weekly QC statistics are used to generate a list of station/variable pairs that will be marked as failing the check for the upcoming week. Station/variable pairs that failed the QC over 75% of the time are placed on the list. Station/variable pairs are removed from the list when the failure rate has fallen below 25%. For AWIPS users, this list is combined with the static entries on the reject list, and updated here on our website once a week as the current, recommended reject list. When OB8.2 has been installed in all offices, the list on the website will revert back to the static list.

To view the subjective intervention lists currently in use at NCEP, click here: reject, accept.

For more information on how to use the reject and accept lists, see: Subjective Intervention Capability.

Change Log:

9/9/99 - Sea-level pressure observations from the Colorado SCHLNET network are added to the reject list. The obs are actually altimeter observations, but are being inappropriately labeled as "SLP" in the data ingest software.

11/2/99 - Altimeter observations from Arizona "MA" stations (in the MesoWest mesonet cooperative) are added to the reject list. The MA stations have very large errors (e.g. 35-87 mb) and, although the QC is flagging them as bad, the 23 stations are in close proximity, and exhibit similar biases. In other words, they reinforce each other and may, therefore, slip through the spatial consistency check undetected.

6/12/00 - "MA" MesoWest stations are removed from reject list. Real-time tests, and conversations with Mike Splitt at the University of Utah, indicate that processing changes made at UU have corrected the altimeter obs.

6/12/00 Dewpoint observations at KMRF and KGDP are removed from the reject list. Real-time tests show that they now enhance humidity analyses near the Mexican border.

10/12/00 KP69 (Lowell, Idaho) is removed from the reject lists at NCEP and on AWIPS, where the elevation information for the station has been corrected. At FSL, the elevation is incorrect, and the station is left on the reject list. The correct lat/lon/elevation information is 46.16, -115.60, 451m.

10/12/00 - Based on advice from the NWS BOU (Boulder, CO) office, the RAWS station at Gunsight, CO (GSPC2) is added to the reject list. GSPC2 has bad dewpoint observations.

10/25/00 - Based on advice from the NWS MFR (Medford, OR) office, the pressures for RAWS stations in California and Oregon are added to the AWIPS reject list. Many other RAWS stations also appear to have bad pressure observations, but most are geographically distributed in such a way that they do not reinforce each other, and are therefore successfully flagged bad by the spatial consistency check. The stations added to the reject list are in close proximity, exhibit similar high biases, and can fool the spatial consistency check into labeling them as good. The FSL reject list is not updated, since FSL does ingest RAWS pressure observations.

1/4/01 - KP69 is removed from the reject list at FSL. The lat, lon, and elevation information is now correct in the /public station table.

9/18/01 - C0093 and C0193, both citizen weather stations in the APRSWXNET mesonet, are added to the reject list on the request of the station operators. C0093 has bad winds and humdiity measurements; C0193 has bad precipitation.

1/15/02 - RAWS pressure observations are now being ingest at FSL, and we have determined that the 60-km MSAS and the 15-km RSAS can both successfuly quality control these data. Therefore, the RAWS stations (in the UTMESNET mesonet) that were added to the AWIPS reject list on 10/25/00 have been removed. This change will be included in the next AWIPS build that contains a new version of MSAS. In the meantime, interested WFOs should edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

6/4/02 - With the implementation of the 15-km RSAS in production on this date, all variables for KOMK have been added to the accept list at FSL, at NCEP, and will be included in the next AWIPS build that contains a new version of MSAS. At 60-km resolution there was no need to add this station to the accept list, but at 15-km resolution we found that this site was in a data-sparse area in Eastern Washington, and had a high rate of false alarms that declared good data to be bad. WFOs do not need to change their accept lists until the new build (that will get this change by default) has been installed.

1/15/03 - KGCC is removed from the reject lists at AWIPS, FSL and NCEP. The altimeter data are now accurate enough to be used, and this fills in a gap where observations are particulary sparse. This change will be included in the next AWIPS build that contains a new version of MSAS. In the meantime, interested WFOs should edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

3/12/03 - AP020 in the APRSWXNET mesonet, has been added to the reject list for altimeter. With high-resolution MSAS/RSAS domains (e.g., 15-km) this station is on the edge of a "data hole" in southwestern Arizona, and the QC can therefore sometimes pass bad data that can then persist in the absence of good observations near the hole, ultimately forming a bullseye.

3/12/03 - At FSL, the FTCOLLINS, UDFCD, MNDOT mesonets, and all stations for the MesoWest CEMP subnetwork, are added to the reject list for altimeter. These networks report station pressure as their pressure variable, which has previously not been ingest by RSAS. As of version 4.1, just installed at FSL, the station pressure observations are now converted to altimeter and then ingest by RSAS. The new data brought in from these mesonets were failing the QC a high percentage of the time. Because these networks include many stations in close proximity to one another, and exhibit similar biases, they reinforce each other and may slip through the spatial consistency check. Therefore, these have been placed on the reject list.

11/18/03 - AR161 in the APRSWXNET mesonet, RNDC1 of the RAWS mesonet, and all stations for the MesoWest TOOELE subnetwork, have been added to the reject list for altimeter at FSL. This change will be included in the next AWIPS build that contains a new version of MSAS (OB4). In the meantime, interested WFOs should edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

1/26/04 - A new capability in AWIPS build OB4 for MSAS is to convert mesonet station pressure observations into altimeter observations, which is a function of pressure and station elevation. Because of the sensitivity of the calculation to inaccuracies in elevation, the default reject list has had an entry added to reject all station pressure for all mesonets, to avoid introducing bullseyes into MSAS. You should remove this line under the following circumstances:

6/25/04 - Altimeter observations for APRSWXNET stations that have failed QC over 80% of the time for the last month (400 stations) have been placed on the reject list at FSL. This change will be included in AWIPS build OB6. In the meantime, interested WFOs should download the FSL reject list from this website and edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

2/8/05 - The QC results were examined for wind, dewpoint, temperature, and altimeter observations for all national non-NOAA networks for the month of January, and all stations that failed 80% or more of the time during that period have been added to the reject list at FSL. All APRSWXNET stations whose altimeter observations were placed on the reject list on 6/25/04 were reexamined, and any that failed less than 25% of the time during January were removed from the list. All told, these adjustments added 534 stations (for all observation types combined) to the list. This change will be included in AWIPS build OB6. In the meantime, interested WFOs should download the FSL reject list from this website and edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

3/17/05 - Altimeter observations for 16 MesoWest China Lake/Fort Irwin stations were placed on the reject list. Bullseyes were forming for both MSAS/RSAS sea level pressure and altimeter, and these were traced back to a bad cluster of these stations in southeast California. These stations were recently added, and a week's worth of QC results were examined. Those stations failing 80% or more of the week were placed onto the reject list. This change will be included in AWIPS build OB6. In the meantime, interested WFOs should download the FSL reject list from this website and edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

4/21/05 - Wind observations for AWS stations CRJLN, HRSON, NESHO, and PRYOR were placed on the reject list. (These changes were made at the request of NWS personnel monitoring these stations.) This change will be included in AWIPS build OB6. In the meantime, interested WFOs should download the FSL reject list from this website and edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

7/14/05 - Altimeter observations for RAWS station NATN7 were placed on the reject list. The obs have been failing 100% of the time and were adding "noise" to errors being tracked by an APRSWXNET station owner. This change will be included in the next AWIPS build after OB6 that contains a new version of MSAS (not yet scheduled). In the meantime, interested WFOs should download the FSL reject list from this website and edit their /awips/fxa/ldad/MSAS/fslparms/reject.txt files to make this change.

11/7/05 - Temperature observations for AWS station BARLA were placed on the reject list at FSL. This station is currently reporting in Celsius when it's supposed to be reporting in Fahrenheit.

1/10/06 - Relative humidity observations for AWS station TLSA2 were placed on the reject list at ESRL/GSD. This station is always reporting 5% RH, which is indicative of a non-working humidity sensor.

1/17/06 - Altimeter observations for APRWXNET stations AR704 and C3355, and WXforYou station H0348 were placed on the reject list at ESRL/GSD. These stations are failing 100% of the time.

6/8/06 - Altimeter observations for APRSWXNET stations AP015, AR967, and for AWS station LNXBC were placed on the reject list at ESRL/GSD. Dewpoint observations for AWS stations CANBY and HARPF were placed on the reject list as well. All of these stations have been failing 100% of the time.

8/8/06 - Altimeter observations for APRSWXNET station C4966 was placed on the reject list at ESRL/GSD. This station has been failing 100% of the time.

9/7/06 - Altimeter stations for several MesoWest (UTMESNET) Oregon DOT stations were placed on the reject list at ESRL/GSD. They have been failing a high percentage of the time, are in close proximity, and exhibit similar biases. In other words, they reinforce each other and may, therefore, slip through the spatial consistency check undetected.

10/16/06 - Temperature and wind observations for APRSWXNET station AP969 have been placed on the reject list at ESRL/GSD. The values being reported for these elements have been continuously unchanging. Note that this does not need to go onto the WFO or NCEP reject lists, since this station is in Spain, which is outside the domains processed at those facilities.

10/25/06 - Dewpoint observations for APRSWXNET station AP896 have been placed on the reject list at ESRL/GSD. The relative humidity values have been stuck at 100%.

11/28/06 - Many of the entries on the reject list at ESRL/GSD have been removed, since they are now covered by a new QC check called the "statistical spatial consistency check". This check was added to improve the accuracy of the observational error estimates, and to reduce the probability of clusters of bad stations degrading the QC results in general. Weekly QC statistics are used to generate a list of station/variable pairs that will be marked as failing the check for the upcoming week. Station/variable pairs that failed the QC over 75% of the time are placed on the list. Station/variable pairs are removed from the list when the failure rate has fallen below 25%.

12/29/06 - Temperature observations for MesoWest stations ELSI and RICH, and APRSWXNET station C4759 have been put on the accept list at ESRL/GSD. These stations are the only ones in Sevier Valley in Utah and have had a high rate of false alarms that declared good data to be bad, since they were being compared with stations outside of the valley.

3/29/07 - Wind observations for MesoWest station UP067 have been put on the reject list at ESRL/GSD. A private sector data user informed us that the winds were wrong compared with other stations in the area, and although it was failing the automated QC quite a bit of the time, it was also passing the QC too often.

11/29/07 - Altimeter and pressure observations from APRSWXNET stations AR165 and C5502, and MesoWest stations NAM01, NAM02, NAM04, NAM09, NAM12, NAM14, NAM17 and NAM18 have been put on the reject list at ESRL/GSD. These observations were consistently too high, and were close enough together to reinforce each other and pass the spatial consistency check, which led to a small bullseye, which in turn, caused good data from other stations to be erroneously flagged as bad.

12/3/07 - Temperature observations for MesoWest stations A05, A17, A23, and A24, and altimeter and pressure observations for MesoWest station A25 have been placed on the accept list at ESRL/GSD. These stations are at the Nevada Test Site operated by the Special Operations and Research Division of the NOAA Air Resources Laboratory. These stations were failing the automated QC at too high a rate, and the operator verified that the data are in fact, good, and asked us to revise the accept list accordingly.

12/12/08 - Altimeter observations for AWS stations in Alberta, Manitoba and Saskatchewan have been put onto the reject list. These stations seem to be biased high (per parallel data assimilation runs with and without these data), and because the number of stations dwarfs that of the standard METARs in the area, they are passing through the QC checks.

03/03/09 - Winds for MesoWest station A17 have been placed onto the reject list at the request of the data provider (NOAA ARL/SORD), due to a failed anemometer.

04/30/09 - The A17 anemometer has been repaired, so it has been removed from the reject list.

06/26/09 - APRSWXNET stations AS692, AT181, C5719, D2261, D2262, D2678, D2728 and D2812 were placed on the reject list for altimeter. This cluster of stations had data several mb too low compared to neighboring METAR and NonFedAWOS stations, and negatively affecting the QC results for those stations.

09/13/10 - APRSWXNET station D3760 placed on the reject list for altimeter, at the request of the data provider. Also removed the Canadian AWS stations placed onto the list 12/12/08 since these data are now being removed before the data are sent out to be processed.


Last updated 13 September 2010.
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