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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-04-07 12:00

amsua
NOAA-19 AMSUA RADIANCES (6 channels affected) : out of range
Considerable: obs_number=5517.0000, expected range: 6422.4515 9641.6662
iasi
METOP-A IASI RADIANCES CHANNEL 292 : out of range
2 times in the last 10 days for at least one item
Severe: avg_fgdepar=-0.0731, expected range: -0.0499 -0.0206
METOP-A IASI RADIANCES CHANNEL 273 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0580, expected range: -0.0434 -0.0182
METOP-A IASI RADIANCES CHANNEL 310 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.1057, expected range: -0.0700 -0.0041
METOP-C IASI RADIANCES CHANNEL 273 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0578, expected range: -0.0446 -0.0193
METOP-C IASI RADIANCES CHANNEL 292 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0685, expected range: -0.0534 -0.0239
METOP-C IASI RADIANCES CHANNEL 552 : out of range
Considerable: stdev_fgdepar=0.4167, expected range: 0.3199 0.3827
cris
NPP CRIS RADIANCES CHANNEL 86 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0750, expected range: -0.0627 -0.0551
NPP CRIS RADIANCES CHANNEL 143 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0891, expected range: -0.0795 -0.0778
NOAA20 CRIS RADIANCES CHANNEL 85 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0096, expected range: 0.0199 0.0282
NOAA20 CRIS RADIANCES CHANNEL 86 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0236, expected range: 0.0395 0.0409
NOAA20 CRIS RADIANCES CHANNEL 133 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1675, expected range: -0.1577 -0.1451
NOAA20 CRIS RADIANCES CHANNEL 134 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1440, expected range: -0.1316 -0.1226
NOAA20 CRIS RADIANCES CHANNEL 143 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0965, expected range: -0.0888 -0.0852
NOAA20 CRIS RADIANCES CHANNEL 87 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0725, expected range: 0.0871 0.0913
NOAA20 CRIS RADIANCES CHANNEL 110 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_fgdepar=-0.0283, expected range: -0.0206 -0.0083
Atmospheric Motion Vector
METEOSAT-11 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Considerable: obs_number=4367.0000, expected range: 3146.3829 3943.3671
GOES-16 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=4471.0000, expected range: 2443.2846 3612.4654
Geostationary CSR
HIMAWARI-8 AHI RADIANCES CHANNEL 4 : out of range
Considerable: obs_number=23552.0000, expected range: 18675.8582 22358.1418
METEOSAT-8 SEVIRI RADIANCES CHANNEL 3 : out of range
Slight: stdev_fgdepar=0.9653, expected range: 0.7823 0.9205
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
5 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 2.8105 241.9938