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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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

Early delivery 4D-VAR at 2019-08-19 00:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.7280, expected range: 2.4475 3.5011
NOAA-18/AMSUA RADIANCES CHANNEL 5 : out of range
Considerable: avg_biascorr=0.2851, expected range: 0.3108 0.4010
iasi
METOP-A/IASI RADIANCES CHANNEL 236 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0687, expected range: 0.0360 0.0548
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3856, expected range: 0.2426 0.3319
METOP-C/IASI RADIANCES CHANNEL 236 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1814, expected range: 0.1012 0.1537
METOP-C/IASI RADIANCES CHANNEL 249 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0746, expected range: -0.0201 0.0393
cris
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
61 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=5.9769, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (171 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=20094.0000, expected range: 8220.6607 8430.0054
NPP/CRIS RADIANCES (12 channels affected) : out of range
4 times in the last 10 days for at least one item
Severe: avg_fgdepar=0.2834, expected range: 0.0403 0.1599
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=60363.0000, expected range: 7085.4568 17964.0568
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: obs_number=20212.0000, expected range: 0.0000 7913.6680
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Severe: obs_number=193.0000, expected range: 282.4306 295.1944
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
Severe: rms_fgdepar=1.4358, expected range: 0.0000 0.6383
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
Considerable: avg_fgdepar=-0.6326, expected range: -0.2439 0.3492
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
3 times in the last 10 days for at least one item
Considerable: avg_fgdepar=4.9989, expected range: 1.4508 3.5892
synop
AUTOMATIC LAND SYNOP RH2M (%) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=72.0000, expected range: 323.9767 345.9057
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=544.0000, expected range: 1077.4146 1409.6442
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=5.0000, expected range: 0.0000 0.0000
Severely_persistent: avg_biascorr=-8.8000, expected range: 0.0000 0.0000
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
17 times in the last 10 days for at least one item
Severely_persistent: rms_fgdepar=86.3535, expected range: 37.4608 53.7001
Severely_persistent: rms_fgdepar=72.5244, expected range: 35.8030 49.2391
Severely_persistent: rms_fgdepar=124.6264, expected range: 38.8058 70.0421
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: obs_number=60.0000, expected range: 165.9490 298.2089
metar
AUTOMATIC METAR SURFACE PRESSURE (PA) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0000, expected range: -160.2165 -74.3219