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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-10 00:00

amsua
AQUA/AMSUA RADIANCES CHANNEL 11 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1906, expected range: 0.2386 0.3166
METOP-C/AMSUA RADIANCES CHANNEL 11 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0816, expected range: -0.0058 0.1078
AQUA/AMSUA RADIANCES CHANNEL 10 : out of range
Considerable: avg_biascorr=0.1361, expected range: 0.1702 0.2565
iasi
METOP-A/IASI RADIANCES CHANNEL 125 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1533, expected range: 0.1987 0.2757
METOP-A/IASI RADIANCES CHANNEL 131 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2268, expected range: 0.2801 0.3582
METOP-C/IASI RADIANCES CHANNEL 6458 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.2899, expected range: 3.3805 5.2626
METOP-B/IASI RADIANCES (42 channels affected) : out of range
Severe: avg_biascorr=0.6797, expected range: -0.1278 0.3851
METOP-C/IASI RADIANCES (46 channels affected) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.6882, expected range: -0.1962 0.3561
cris
NPP/CRIS RADIANCES (321 channels affected) : out of range
Severe: obs_number=22424.0000, expected range: 120404.4090 128622.8541
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
Severe: avg_fgdepar=37.3187, expected range: -7.8132 13.2442
NPP/CRIS RADIANCES CHANNEL 1157 : out of range
Severe: avg_fgdepar=43.1463, expected range: -5.6383 10.6525
NPP/CRIS RADIANCES CHANNEL 1164 : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=27.1843, expected range: -8.4829 11.2171
NPP/CRIS RADIANCES CHANNEL 1251 : out of range
Severe: avg_fgdepar=46.1750, expected range: -5.6628 11.6304
NOAA20/CRIS RADIANCES (234 channels affected) : out of range
Severe: obs_number=124856.0000, expected range: 21499.8430 24061.0498
NOAA20/CRIS RADIANCES (206 channels affected) : out of range
Severe: stdev_fgdepar=0.1423, expected range: 0.0951 0.1214
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0108, expected range: 0.0122 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.0107, expected range: 0.0121 0.0136
gpsro
METOP-A/GRAS SETTING (24 impact heights affected) : out of range
Severe: obs_number=882.0000, expected range: 1493.3880 2133.1675
METOP-A/GRAS RISING (24 impact heights affected) : out of range
Considerable: obs_number=760.0000, expected range: 1108.5102 1798.7330
Atmospheric Motion Vector
HIMAWARI-8 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 900-1200 (HP : out of range
Slight: stdev_fgdepar=1.1426, expected range: 0.8927 1.0933
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
Slight: obs_number=9725.0000, expected range: 11115.2937 19800.7630
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1169, expected range: 0.0511 0.0842
All DROP SONDE TEMPERATURE (K) ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 0.00 701.05
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=278.0000, expected range: 373.6737 473.2152
synop
BUFR LAND SYNOP RH2M (%) : out of range
8 times in the last 10 days for at least one item
Severely_persistent: obs_number=148.0000, expected range: 163.1570 171.9018
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Severe: obs_number=54.0000, expected range: 55.0000 55.0000
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Slight: obs_number=8659.0000, expected range: 8950.6076 10187.4480
metar
AUTOMATIC METAR SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=-130.0000, expected range: 0.0000 0.0000