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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-14 12:00

amsua
NOAA 19 AMSUA ALL SKY RADIANCES CHANNEL 10 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1381, expected range: 0.0523 0.0944
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2863, expected range: -0.2526 -0.2287
mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=5816.0000, expected range: 6595.8093 6823.4236
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 2 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=1.1018, expected range: 0.7966 0.8603
Severely_persistent: avg_biascorr=-2.4105, expected range: -1.8246 -1.1961
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 4 : out of range
3 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=-0.1867, expected range: -0.0974 -0.0010
Severe: stdev_norm_fgdepar=0.8582, expected range: 0.6602 0.6776
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 5 : out of range
3 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=-0.2547, expected range: -0.0919 0.0927
Severe: stdev_norm_fgdepar=0.9890, expected range: 0.6804 0.7009
Slight: avg_norm_fgdepar=-0.1058, expected range: -0.0493 0.0711
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 6 : out of range
2 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=-0.2043, expected range: -0.0803 0.0807
Severe: stdev_norm_fgdepar=1.0227, expected range: 0.6758 0.7182
Severe: avg_norm_fgdepar=-0.2408, expected range: -0.0921 0.1057
Slight: avg_norm_fgdepar=-0.1116, expected range: -0.0640 0.0886
FY-3D MWHS2 ALLSKY RADIANCES (5 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-3.3792, expected range: -2.4743 -2.4112
atms
NPP ATMS RADIANCES CHANNEL 10 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2266, expected range: -0.2731 -0.2579
NPP ATMS RADIANCES CHANNEL 11 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1193, expected range: -0.2329 -0.2025
Atmospheric Motion Vector
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
4 times in the last 10 days for at least one item
Considerable: stdev_press=32.1842, expected range: 38.7402 46.7511
METOP-C AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: avg_fgdepar=4.4345, expected range: 3.8596 4.1683
GOES-17 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HP : out of range
Considerable: obs_number=373.0000, expected range: 552.7455 794.0545