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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-18 12:00

iasi
METOP-A/IASI RADIANCES CHANNEL 236 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0702, expected range: 0.0241 0.0548
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3823, expected range: 0.2426 0.3319
METOP-A/IASI RADIANCES CHANNEL 256 : out of range
3 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=0.1971, expected range: 0.2047 0.2335
cris
NPP/CRIS RADIANCES CHANNEL 622 : out of range
29 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.2717, expected range: 0.0440 0.1599
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
58 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=4.4198, expected range: -0.3076 0.3155
Severely_persistent: stdev_fgdepar=2.6459, expected range: 0.0709 0.3529
NOAA20/CRIS RADIANCES CHANNEL 34 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3476, expected range: 0.2259 0.3028
NOAA20/CRIS RADIANCES CHANNEL 33 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2745, expected range: 0.1458 0.2242
NOAA20/CRIS RADIANCES CHANNEL 35 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3701, expected range: 0.2876 0.3410
NPP/CRIS RADIANCES (171 channels affected) : out of range
3 times in the last 10 days for at least one item
Severe: obs_number=16755.0000, expected range: 7305.2578 8057.7195
mhs
ALLSKY METOP-A/MHS RADIANCES CHANNEL 3 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.7505, expected range: 0.2371 0.5273
ALLSKY METOP-A/MHS RADIANCES CHANNEL 4 : out of range
6 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.7115, expected range: 0.1773 0.5209
ssmis
DMSP-18/SSMIS RADIANCES (16 channels affected) : out of range
Slight: obs_number=1607.0000, expected range: 2867.0948 10679.2169
Atmospheric Motion Vector
METEOSAT-11/AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
Slight: obs_number=1378.0000, expected range: 531.3378 1279.6034
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: obs_number=64396.0000, expected range: 7085.4568 17964.0568
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: obs_number=18284.0000, expected range: 1344.6016 7913.6680
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0000, expected range: 0.4001 0.6186
HIGH RESO LAND TEMP WIND VECTOR DIFF (M/S) (3 pressure layers affected : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=91.0000, expected range: 182.3750 197.3750
amdar
WIGOS AMDAR WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
1 times in the last 10 days for at least one item
Severe: avg_fgdepar=7.0054, expected range: 1.4733 3.5811
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
9 times in the last 10 days for at least one item
Severely_persistent: obs_number=516.0000, expected range: 1092.0154 1343.3179
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=5.4545, expected range: 0.0000 0.0000
Severely_persistent: obs_number=71.0000, expected range: 79.6662 90.2227
BUFR LAND SYNOP SURFACE PRESSURE (PA) : out of range
14 times in the last 10 days for at least one item
Severely_persistent: rms_fgdepar=80.4275, expected range: 38.6904 59.6116
Severely_persistent: rms_fgdepar=68.4565, expected range: 38.0069 55.1296
Severely_persistent: rms_fgdepar=115.4365, expected range: 37.4898 75.7990
BUFR LAND SYNOP RH2M (%) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=83.0000, expected range: 84.0000 84.0000
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: obs_number=60.0000, expected range: 177.9856 288.2482
metar
AUTOMATIC METAR SURFACE PRESSURE (PA) : out of range
1 times in the last 10 days for at least one item
Severe: avg_biascorr=0.0000, expected range: -160.1396 -75.2756