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312/Oct/2020

With the release of the October 2020 real-time forecast (at 12 UTC on 13th October) some additions will be introduced to the list of available forecasting systems. Specifically:

Contribution from JMA CPS2 system will be included
Upgrade of CMCC contribution, to the new operational seasonal forecasting system SPSv3.5

Additionally, with the release of the November 2020 real-time forecast (at 12 UTC on 13th November), another change of forecasting systems will be included. Specifically:

Upgrade of DWD contribution to the new operational forecasting system GCFS2.1

Details about hindcast dates available can be found here. The complete list of parameters available for each forecasting system can be found here.

13/June/2020

With the release of June 2020 real-time forecast (at 12UTC on the 13th June) some changes have been introduced to the geographical regions available at C3S seasonal forecast graphical products (https://climate.copernicus.eu/charts/c3s_seasonal). Specifically:
- A new area called "Pacific Islands" has been added to cover in detail that region of the world
- The area called "South America" has been amended, so it accurately covers the whole South American sub-continent.
- The area called "Tropics" has been amended to be centred over the International Date Line (meridian 180º)

All these changes have been introduced starting from June 2020, and previously produced plots haven't been affected by them.

15/May/2020

The issue affecting availability of NCEP CFSv2 members in the high-frequency (daily/subdaily) datasets reported as "known issue" E7 (C3S Seasonal Forecast known issues) has been now fixed and all NCEP CFSv2 members are now available for users to retrieve.

12/ May/2020

As it happens every year, label "system" for the UK Met Office contribution to C3S seasonal forecast activity has been updated to a new value (system=15) starting from May 2020 real-time forecasts
- Please note that due to the production of hindcasts "on-the-fly", the CDS keyword 'system' does not have the same meaning as for the other contributors. Instead, it is just an indexing label that gets changed once per year.
- More info in the "Summary of available data" and in the "Seasonal forecasts and the Copernicus Climate Change Service" pages

25/March/2020

An error in the retrieval of high-frequency data (daily/subdaily) from NCEP seasonal forecast data (NCEP CFSv2) data has been detected. This has been documented as "known issue" E7 (C3S Seasonal Forecast known issues)
It affects all data available in the high-frequency (daily/subdaily) datasets:
- Seasonal forecast daily data on single levels (seasonal-original-single-levels)
- Seasonal forecast daily data on pressure levels (seasonal-original-pressure-levels)
Members with start time at 06h,12h and 18h are not being retrieved from the archive by the CDS and just members with start time at 00h are returned.

11/February/2020

An error in the processing of surface solar radiation variables for NCEP has been reported (Known issue E6 in the "not fixed issues" section here)
- The parameters "surface net solar radiation" and "surface solar radiation downwards" (and their counterparts in the monthly statistics and anomalies datasets) have been accidentally swapped with each other in the case of
  - Forecasts with nominal start dates from October 2019 to February 2020 (both included)
  - Hindcasts with nominal start dates October, November, December, January and February
- A fix has been already introduced in the operational production of C3S data; starting from nominal start date March 2020 real-time forecast data (and its corresponding hindcasts) will not be affected by this.
- A recovery process for the affected data already published will be put in place. Details about when this will become available will be announced here.

8/January/2020

The recovery process for missing monthly and anomalies data for NCEP contribution has been now finished. More details in known issues E4.a1 and E4.a2 ("fixed issues" section here).

13/December/2019

With the release of December 2019 C3S seasonal forecasts a new encoding for monthly data has been implemented allowing users to get the real initialization date of each individual ensemble member from lagged start forecasting systems.
More information here.
Related information about known issues here (items E4.a1 and E4.a2)

2/December/2019

A data issue has been recently reported affecting CMCC contribution data for start dates between March and September. The impact of those errors is quite limited in general, but it can be noticeable for "geopotential height" variable in pressure levels.
More details can be found in known issues E5a and E5b here.

29/November/2019

The recovery process for wrong snowfall data from CMCC contribution has been now finished. More details in known issues E3a, E3b, E3c and E3d ("fixed issues" section here)

7/November/2019

The recovery process for the wrong snowfall data from CMCC contribution has started for the November start date hindcasts (i.e. 1993 to 2016). More details can be found in known issues E3.a ("not fixed errors" section here)

11/October/2019

All the relevant documentation for the new forecasting systems to be released with October 2019 real-time forecasts (Météo-France System7 and NCEP CFSv2) is now available.
Due to technical reasons, the publication of monthly mean data for NCEP has been delayed, but the full set of high-frequency data will be available as expected in the CDS. This has been recorded as known issue E4 (see details here in the "not fixed errors" section)
- As a side effect, publication of updated MetOffice hindcasts for November nominal start date (system=14) is also delayed.
- The current estimate is that all the above-mentioned delayed data would be made available on the week commencing on 4th November.

22/August/2019

An upgrade to Météo-France contribution (change of operational forecasting system from System 6 to System 7) will be introduced from October 2019 nominal start date. Documentation for the new system here.
A new data stream will be added to the C3S seasonal forecast multi-system in October 2019. This data comes from NCEP's Climate Forecast System version 2 (CFSv2). Documentation for this system here.

5/April/2019

An upgrade to MetOffice contribution (change of forecasting system version to GloSea5-GC2-LI) has been introduced from May 2019 nominal start date.

This document has been produced in the context of the Copernicus Climate Change Service (C3S).

The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.

The user thereof uses the information at its sole risk and liability. For the avoidance of all doubts, the European Commission and the European Centre for Medium-Range Weather Forecasts has no liability in respect of this document, which is merely representing the authors view.