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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2020-05-27 12:00

iasi
METOP-B IASI RADIANCES CHANNEL 217 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1104, expected range: -0.0991 -0.0914
cris
NOAA20 CRIS RADIANCES CHANNEL 66 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1481, expected range: 0.1635 0.1675
Atmospheric Motion Vector
All AQUA MODIS CLEAR WV ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 172.09 1735.22
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-60 : out of range
Considerable: obs_number=5580.0000, expected range: 3293.2993 4843.4507
GOES-17 AMV IR1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
Considerable: obs_number=1403.0000, expected range: 294.9073 1069.7104
Radiosondes
All LAND TEMP ALL LAYERS WMO BLOCK 43 : all data missing
Severely_persistent: obs_number=0, expected range: 46.26 160.14
HIGH RESO LAND TEMP TEMPERATURE (K) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: rms_fgdepar=3.9457, expected range: 0.7728 1.5446
Severe: avg_fgdepar=3.6640, expected range: -0.0693 0.3338
Severe: rms_fgdepar=6.6406, expected range: 0.0000 3.0861
HIGH RESO LAND TEMP TEMPERATURE (K) (3 pressure layers affected) : out of range
Severe: obs_number=90.0000, expected range: 173.5856 187.6644
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
Severe: obs_number=553.0000, expected range: 173.5038 201.2462
HIGH RESO LAND TEMP Q (G/KG) PRESSURE LAYER 0-300 (HPA) : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=396.0000, expected range: 522.8063 536.6937
Considerable: obs_number=173.0000, expected range: 193.7978 200.8689
All HIGH RESO LAND TEMP ALL LAYERS WMO BLOCK 26 : all data missing
Severe: obs_number=0, expected range: 81.72 138.28
HIGH RESO LAND TEMP Q (G/KG) (3 pressure layers affected) : out of range
Considerable: obs_number=93.0000, expected range: 157.1705 207.5795
prof
All EUROPEAN WIND PROFILER ALL LAYERS South West Pacific : all data missing
Severe: obs_number=0, expected range: 364.38 694.62
All EUROPEAN WIND PROFILER ALL LAYERS West pacific Tropica : all data missing
Severe: obs_number=0, expected range: 364.38 694.62
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) (2 pressure layers affected) : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1046.0000, expected range: 2000.9351 2425.3149
synop
BUFR LAND SYNOP RH2M (%) : out of range
Considerable: obs_number=304.0000, expected range: 326.4645 361.2855
buoy
MOORED BUOYS WIND VECTOR DIFF (M/S) : out of range
Considerable: obs_number=77.0000, expected range: 82.5734 92.6897