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General issue for models using WW3
Wrong peak wave period
Because of an error in WW3, the values of Peak wave period might be occasionally wrong if a centre running the affected version of WW3 does not apply a dedicated fix to remove such wrong values in their model outputs.
Currently in LC-WFV project we have had to relax the upper limit for Peak wave period and the centres NIWA, BoM, LOPS so that even those occasional values higher than 80 are archived. Otherwise that parameter could not be archived at all for those centres.
METEOAM (cnmc)
Mean zero-crossing wave period issue at step 0
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- JMA (rjtd) => changed to simple packing since 0Z 2019-04-03
- ECCC (cwao) => changed to simple packing since 12Z 2019-07-03
- KMA (rksl) => changed to simple packing since 12Z 2019-07-09
DMI (ekmi)
U/V component sign problem Fixed from 12Z 2019-07-16 onwards
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10m wind issue Fixed from 2019-10-01 onwards
Description:
There is a problem with 10m wind forecasts which can be illustrated by comparing wind speed and wind components from ECMWF and Meteo-France:
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NCEP (kwbc)
Too high Peak wave period values in some grid points (fix will be implemented in the next model upgrade)
Description:
Occasionally there are excessively high peak wave period values (>50s) affecting just single grid points.
ECCC (cwao)
Too high or negative Peak wave period values in some grid points (fix will be implemented in the next model upgrade expected in Nov 2021)
Description:
Occasionally there are excessively high (>100s) or negative peak wave period values affecting just single grid points.
Some more information on the issue is available in https://github.com/NOAA-EMC/WW3/issues/304
NZMS (nzkl)
Missing 10 metre V wind component in the period 14-09-2020...23-05-2021
Description:
10 m V wind component has been missing since 14-09-2020 after the model change. The issue has been fixed since 24-05-2021
Different number of longitude points in the period 14-09-2020...11-06-2021 (technical imperfection not affecting the data)
Description:
NZMS data after the model upgrade on 14-09-2020 contained grid with 1441 longitude points from 0 to 359.9 degrees instead of the intended 1440 points from 0 to 359.75 degrees corresponding exactly to 0.25 degrees resolution. The extra grid point made the resolution slightly less than 0.25. The fix has been applied since 0Z, 11-06-2021 run.
Negative Peak wave period values in some grid points (fixed on )
Description:
Occasionally there are negative peak wave period values mostly in a small region in the Arctic Ocean. It seems that in some edge cases the ice concentration is making troubles in the quadratic fit used to obtain the peak period.
BoM (ammc)
Negative Peak wave period values in some grid points (fixed on )
Description:
Because of an error in the grid conversion, the minima of Peak wave period could be occasionally wrong (negative up to -100). That issue affected the period Sep-Oct 2022.
METNO (enmi)
Issue with 10 U/V values in the period 12Z, 2023-03-08 - 6Z, 2023-05-08 (fixed since 6Z onwards)
Description:
https://jira.ecmwf.int/servicedesk/customer/portal/4/SD-75112
The values of 10 U/V component are wrong in some gridpoints and for some time steps in the period 12Z, 20230308 - 6Z, 20230508
That issue seemed to affect always just 2 steps (+33 and +54). According to the provider, those corrupt values were solely above Novaja Semlja and did not compromise the wave model results otherwise.