Operational Data Checking

An automatic data checking system has been implemented at ECMWF to trigger warnings in case of anomalies affecting the quality or the availability of the data assimilated by the model. Selected statistical parameters (number of observations, bias correction, and mean bias-corrected background, analysis departures and probability of gross error) are checked against an expected range. An appropriate alert message (including a time series plot) is generated if statistics are outside the specified ranges. A severity level (slight, considerable, severe) is assigned to each message depending on how far statistics are from the expected values. Two kinds of ranges are used by the automatic checking: Soft and Hard limits. Soft limits are updated automatically using statistics from the last twenty days (extremes are excluded during this process). Hard limits are adjusted manually when required.

Currently, the automatic checking is limited to data passing through the minimisation process (including VarBC passive data). It's being applied twice a day to the delayed cut-off 4D-VAR cycles (00 and 12) and four times a day to the early delivery assimilation system (00,06,12 and 18).

The alarm system results are based on feedback information from the ECMWF data assimilation and consequently reflect the ECMWF data usage. Although most warnings are related to data problems, they may on occasion also be related to model issues. Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice. ECMWF accepts no responsibility for actions taken on the basis of these results.

Ensemble Data Assimilation at 2022-01-18 12:00

amsua
NOAA 15 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0888, expected range: -0.1222 -0.1068
NOAA 18 AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4339, expected range: -0.4049 -0.3667
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1501, expected range: 0.0700 0.0944
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2393, expected range: 0.2707 0.2836
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2810, expected range: -0.2526 -0.2430
iasi
METOP-C IASI RADIANCES CHANNEL 3248 : out of range
Slight: stdev_fgdepar=0.6281, expected range: 0.4249 0.6130
airs
AQUA AIRS RADIANCES (130 channels affected) : out of range
Severe: obs_number=4444.0000, expected range: 9560.9850 10696.0738
mhs
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 1 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1394, expected range: 0.1190 0.1263
METOP-B MHS ALLSKY RADIANCES CHANNEL 1 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.1357, expected range: 0.1119 0.1245
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-3.2784, expected range: -1.8246 -1.1961
Severely_persistent: avg_biascorr=-3.1978, expected range: -2.2649 -1.3118
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0450, expected range: 0.7711 0.8737
atms
NOAA20 ATMS RADIANCES CHANNEL 14 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3069, expected range: -0.2719 -0.2264
NOAA20 ATMS RADIANCES CHANNEL 10 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3421, expected range: -0.4143 -0.3931
ssmis
DMSP-17 SSMIS RADIANCES CHANNEL 5 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1270, expected range: 0.1918 0.2565
DMSP-17 SSMIS RADIANCES CHANNEL 12 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14156.0000, expected range: 16818.9246 19425.3107
DMSP-17 SSMIS RADIANCES CHANNEL 13 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14166.0000, expected range: 16832.0113 19458.9299
DMSP-17 SSMIS RADIANCES CHANNEL 14 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14017.0000, expected range: 16730.3814 19229.0304
DMSP-17 SSMIS RADIANCES CHANNEL 16 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=14151.0000, expected range: 16745.8030 19428.3146
Atmospheric Motion Vector
HIMAWARI-8 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
16 times in the last 10 days for at least one item
Severely_persistent: obs_number=237.0000, expected range: 1210.0967 1384.9190
All METEOSAT-11 AMV IR3 ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 958.77 3317.60
Geostationary CSR
METEOSAT-8 SEVIRI RADIANCES CHANNEL 2 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=57018.0000, expected range: 30618.3999 46544.2069
METEOSAT-8 SEVIRI RADIANCES CHANNEL 3 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=33747.0000, expected range: 16677.4080 29352.9965
amdar
AMDAR TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : missing
1 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 25.2419 150.7752