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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-01-10 00:00

mhs
METOP-B MHS ALLSKY RADIANCES CHANNEL 5 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=5431.0000, expected range: 6595.8093 7021.3441
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 7 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: obs_number=5016.0000, expected range: 5600.9983 5805.4367
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 14 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=6209.0000, expected range: 7907.5258 8048.8981
FY-3D MWHS2 ALLSKY RADIANCES CHANNEL 15 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=5280.0000, expected range: 6688.3813 6734.9279
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1392, expected range: -0.2337 -0.2025
gpsro
COSMIC2-E3 GPSRO SETTING (11 impact heights affected) : out of range
Considerable: obs_number=1377.0000, expected range: 1636.9976 2654.7524
Atmospheric Motion Vector
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
Considerable: avg_press=475.7636, expected range: 411.0524 445.9499
Geostationary CSR
All GOES-16 ABI ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 56778.14 83323.71
mwri
FY-3D MWRI RADIANCES (6 channels affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2667.0000, expected range: 2876.2718 3353.5456