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1. Brief description: The data values for snow density are very different to other models. According to CMA the reason is that their model produces very little amount of snow. The checked extremes of the snow density have to been relaxed because of that specifically for CMA data. 2. Recommendation: Users should consider it when using CMA snow density data |
ECCC (cwao)
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Sea-ice cover values in some
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re-forecast data (period 20.9.-13.12. 2018).
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1. Brief description: The sea-ice values from two hindcast years 2016 and 2017 are not correct in all Thursday's ECCC hindcasts outputs in the period 20.9.-13.12. 2018. Other hindcast years were not affected. 2. Recommendation: Users should not use the affected data. |
U and V components on pressure levels (period 11.7.2019-10.1.2020).
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1. Brief description: See an example of meridional wind at 200 hPa for the ECCC forecast initialized on 7 Nov. 2019 (incorrect contours around 40E and 200E). This interpolation error affects both real-time and reforecast data.
2. Recommendation: Users should consider it when using that data . |
ECMWF (ecmf)
issue with accumulated fields at day 16
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1. Brief description: There is an issue in the "accumulated" fields at day 16 which occurs when the IFS model resolution changes. This creates a discontinuity in the data (it can be seen also in the data on the native model grid so it's not specifically a result of the regridding to the 1.5 degree S2S resolution) which manifests itself when one "deaccumulates" the data to create six hourly accumulations for example. Specifically, one will see discontinuities between the (T+360 - T+354) and (T+366 - T+360) accumulations (most people note large negative total precipitation values but it also affects the radiation parameters). 2. Recommendation: Users should consider that issue when using the accumulated fields. Regrettably, there is not much it can be do about this for the S2S data which has already been regridded from the native model grid to a 1.5 degree. It would need the deaccumulation to be performed using two different values at T+360, one based on the higher resolution grid which is used to compute (T+360 - T+354) and one on the lower resolution grid which is used to compute (T+366 - T+360). Read more about the issue:
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