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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-07-22 12:00

amsua
NOAA-15 AMSUA RADIANCES CHANNEL 12 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4090, expected range: 0.3549 0.3821
NOAA-15 AMSUA RADIANCES CHANNEL 13 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.6173, expected range: 0.5302 0.5666
NOAA-19 AMSUA RADIANCES CHANNEL 14 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=1.1313, expected range: 0.9381 1.0239
iasi
METOP-A IASI RADIANCES CHANNEL 5480 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2915, expected range: -0.2595 -0.2249
METOP-A IASI RADIANCES CHANNEL 151 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3426, expected range: -0.2865 -0.2612
METOP-A IASI RADIANCES CHANNEL 252 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5047, expected range: -0.4368 -0.3775
METOP-A IASI RADIANCES CHANNEL 3029 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: obs_number=749.0000, expected range: 241.7088 394.1899
METOP-A IASI RADIANCES CHANNEL 3049 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: obs_number=728.0000, expected range: 237.7293 363.3177
METOP-C IASI RADIANCES CHANNEL 5383 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: obs_number=2961.0000, expected range: 2084.1612 2329.7316
METOP-C IASI RADIANCES CHANNEL 151 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3547, expected range: -0.3207 -0.2966
METOP-C IASI RADIANCES CHANNEL 252 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5038, expected range: -0.4504 -0.3924
METOP-A IASI RADIANCES (31 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0031, expected range: 0.0678 0.1018
All METOP-B IASI ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 19638.86 25313.81
METOP-C IASI RADIANCES (15 channels affected) : out of range
Considerable: obs_number=1586.0000, expected range: 1741.5729 2359.2506
airs
AQUA AIRS RADIANCES CHANNEL 1123 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0027, expected range: 0.0565 0.0770
AQUA AIRS RADIANCES CHANNEL 92 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4760, expected range: -0.4090 -0.4079
AQUA AIRS RADIANCES CHANNEL 104 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2557, expected range: -0.1800 -0.1748
AQUA AIRS RADIANCES CHANNEL 116 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2820, expected range: -0.2181 -0.2100
AQUA AIRS RADIANCES CHANNEL 128 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2014, expected range: -0.1589 -0.1297
AQUA AIRS RADIANCES CHANNEL 180 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7953, expected range: -0.7228 -0.6982
AQUA AIRS RADIANCES CHANNEL 1111 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_fgdepar=0.5648, expected range: 0.3273 0.5008
atms
NPP ATMS RADIANCES CHANNEL 12 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3495, expected range: -0.3065 -0.2918
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4462, expected range: -0.3966 -0.3962
Atmospheric Motion Vector
All GOES-17 AMV CLOUDY WV3 ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 1081.17 2132.27
GOES-16 AMV CLOUDY WV3 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HP : out of range
Slight: stdev_press=26.9317, expected range: 28.0926 29.3577
Geostationary CSR
All GOES-17 GEOS RADIANCES ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 35438.69 110275.78
amdar
ADS-C TEMPERATURE (K) PRESSURE LAYER 300-600 (HPA) : missing
6 times in the last 10 days for at least one item
Severely_persistent: obs_number=0.0000, expected range: 0.0000 269.0297
gbrad
GROUND-BASED RADAR WIND VECTOR DIFF (M/S) : out of range
Considerable: stdev_fgdepar=0.1765, expected range: 0.2838 0.4788