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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-08-17 06:00

amsua
NOAA-19/AMSUA RADIANCES CHANNEL 8 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=1.8142, expected range: 2.4475 3.4026
AQUA/AMSUA RADIANCES CHANNEL 11 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1911, expected range: 0.2095 0.2251
iasi
METOP-A/IASI RADIANCES CHANNEL 5399 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4031, expected range: 0.2426 0.3319
METOP-B/IASI RADIANCES CHANNEL 386 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4554, expected range: -0.4770 -0.4770
METOP-A/IASI RADIANCES CHANNEL 362 : out of range
Severe: stdev_fgdepar=0.2017, expected range: 0.2151 0.2414
METOP-A/IASI RADIANCES CHANNEL 350 : out of range
Considerable: stdev_fgdepar=0.2091, expected range: 0.2189 0.2516
METOP-A/IASI RADIANCES CHANNEL 352 : out of range
Considerable: stdev_fgdepar=0.2117, expected range: 0.2216 0.2568
cris
NPP/CRIS RADIANCES CHANNEL 1149 : out of range
53 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.5295, expected range: 0.0709 0.3529
NPP/CRIS RADIANCES (39 channels affected) : out of range
Severe: obs_number=12171.0000, expected range: 7598.5609 8057.7195
NPP/CRIS RADIANCES (11 channels affected) : out of range
3 times in the last 10 days for at least one item
Severe: avg_fgdepar=0.2719, expected range: 0.0419 0.1599
NOAA20/CRIS RADIANCES CHANNEL 645 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1243, expected range: 0.0441 0.1045
NOAA20/CRIS RADIANCES CHANNEL 5 : out of range
Slight: obs_number=10949.0000, expected range: 11124.0608 11883.9948
NOAA20/CRIS RADIANCES CHANNEL 6 : out of range
Slight: obs_number=10981.0000, expected range: 11199.0199 11856.8412
NOAA20/CRIS RADIANCES CHANNEL 8 : out of range
Slight: obs_number=10963.0000, expected range: 11162.9952 11869.9492
NOAA20/CRIS RADIANCES CHANNEL 15 : out of range
Slight: obs_number=11175.0000, expected range: 11252.7438 11832.4785
NOAA20/CRIS RADIANCES CHANNEL 18 : out of range
Slight: obs_number=11049.0000, expected range: 11234.3293 11844.7262
NOAA20/CRIS RADIANCES CHANNEL 20 : out of range
Slight: obs_number=11149.0000, expected range: 11263.3429 11840.0269
NOAA20/CRIS RADIANCES CHANNEL 52 : out of range
Slight: obs_number=11159.0000, expected range: 11262.2289 11825.3822
NOAA20/CRIS RADIANCES CHANNEL 54 : out of range
Slight: obs_number=10910.0000, expected range: 11110.6450 11878.9939
NOAA20/CRIS RADIANCES CHANNEL 55 : out of range
Slight: obs_number=11160.0000, expected range: 11279.6379 11831.5402
NOAA20/CRIS RADIANCES CHANNEL 58 : out of range
Slight: obs_number=10889.0000, expected range: 11016.2097 11940.5574
mhs
ALLSKY METOP-A/MHS RADIANCES CHANNEL 3 : out of range
2 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.6685, expected range: 0.2371 0.5161
ALLSKY METOP-A/MHS RADIANCES CHANNEL 4 : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_norm_fgdepar=0.6202, expected range: 0.1773 0.4853
Atmospheric Motion Vector
All AQUA/MODIS CLEAR WV WIND VECTOR DIFF (M/S) ALL LAYERS Missing
METEOSAT-8/AMV CLOUDY WV1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_press=242.7488, expected range: 199.4389 232.4027
Geostationary CSR
GOES-15/IMAGER RADIANCES CHANNEL 2 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=63638.0000, expected range: 7117.8674 17964.0568
GOES-15/IMAGER RADIANCES CHANNEL 3 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: obs_number=20437.0000, expected range: 1431.8685 7913.6680
GOES-16/ABI RADIANCES CHANNEL 2 : out of range
Severe: obs_number=21700.0000, expected range: 38812.9954 52667.0046
GOES-16/ABI RADIANCES CHANNEL 3 : out of range
Severe: obs_number=21701.0000, expected range: 38819.8290 52665.0776
GOES-16/ABI RADIANCES CHANNEL 4 : out of range
Severe: obs_number=21702.0000, expected range: 38689.6146 52888.8591
synop
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=56.6667, expected range: -10.6852 14.2483
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-110.0000, expected range: 0.0000 0.0000