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Met Office
(all systems)

Near-surface temperatures (6-hourly and daily minimum and maximum) and dewpoint temperature are encoded as being calculated at a height of 2m.
Those parameters are calculated at 1.5 meters height in Met Office seasonal forecast systems

Met Office
(system=12)

Global grid is incomplete (just 180 latitude points, between 90S and 89N)
Requests with MARS-based interpolations (i.e. using "grid=NN/NN") won't work unless a suitable regional subselection is requested (with "area=LL/LL/LL/LL")

Note that additionally, in this grid all points are set at integer values of latitude/longitude

D3.

All parameters on pressure levels are not globally complete, having "missing value indicators" in points below the orography.

There is an issue with the postprocessing used at origin of the lagged start dates.

Only members #27 to #51 are affected having data with a time shift of 7 days (168 hours). For instance, data with date/time labelled as YYYYMM08 00h would in fact correspond to YYYYMM01 00h.

There are anomalous values of SST (and associated parameters, e.g. fluxes, and vertical oceanic temperature profiles) appearing in the first hours of a very limited number of ensemble members of forecasts.

The issue is caused by a bug in the oceanic perturbation generation tools used at origin to produce the ocean initial conditions.  The errors/perturbations appear initially as excessively high SST values, confined to the reported hindcast years, in a limited number of grid points all in the tropical Pacific. They are very quickly dissipated by the coupled model physics and dynamics, affecting, therefore, only the first 24 hours of the forecasts at most.

There are some variables affected by a spin-up issue. This affects just some ensemble members depending on the initial conditions each member started from. Unfortunately, as the selection of the forecast members is done randomly from a bigger pool of initial conditions, there is no metadata describing this in the current service based on GRIB files stored in ECMWF's MARS archive.

DWD
(system=2)

All 1981-2016 start dates
2017-2022 January to July
November 2022 to June 2023 

All

The outputs from ACCESS-S2 in vertical pressure levels haven't been postprocessed to fill the holes below the terrain. In those grid points where the pressure at the surface is lower than a given pressure level the variables have been set to a missing value indicator and therefore they have not been extrapolated to produce a globally complete field. Due to this, the T850 and 500hPa graphical products from BOM include missing values, and BOM is excluded from the multi-system combination for these variables.