14/November/2022
Completion of ECMWF Data Handling System (DHS) move.
At 18:41 on Friday 11/November/2022 the disruption to the ECMWF DHS, where C3S seasonal forecast data is hosted, was declared as finished marking the successful completion of the move from Reading headquarters to Bologna Data Centre.
30/October/2022
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Data availability during ECMWF DHS move
(Announcement date: 31/August/2022. Update: 30/October/2022)
- The completion of the DHS move has been now delayed to the end of the week commencing on 7 November.
- In these last stages of the DHS move some of the data previously available (and listed in the table below) may be temporarily unavailable until the full move is completed.
(Announcement date: 31/August/2022. Update: 12/October/2022)
The data listed in the following table is expected to be available during the limited access period (5-6 weeks from 8/Sep/2022) caused by ECMWF move of its Data Handling System to Bologna.
Users are encouraged to download before 8/Sep/2022 any data not listed in the table they might need during that period. Any change to this schedule will be announced here.
| Data streams | Forecasting systems(1) | Nominal start dates |
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| daily data | MetOffice GloSea6 (system=601) | Sep to Dec 1993-2016 |
| All operational systems | Sep and Oct 2022 (2) |
| monthly data | All operational systems | Jun to Dec1993-2016 |
| All operational systems | Mar to Oct 2022 (2) |
| ECMWF SEAS5 (system=51) | Oct to Dec 1993-2016 |
| anomalies data (3) | All operational systems | Mar to Oct 2022 (2) |
NOTES:
(1) This is the list of all currently operational forecasting systems: ECMWF SEAS5, Météo-France System8, MetOffice GloSea6 (system=601), CMCC SPSv3.5, DWD GCFS2.1, NCEP CFSv2, JMA CPS3, ECCC CanCM4i and ECCC GEM5-NEMO
(2) Real-time forecast data won't be available until its usual release date (13th of the month at 12 UTC)
(3) This also includes the data used to compute the anomalies ("ensemble mean" and "hindcast climate mean") which are available via the "monthly" CDS datasets
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| title | USER ACTION REQUIRED |
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12/October/2022Changes to operational forecast system from ECMWF From November 2022 a new version of ECMWF SEAS5 output will substitute the current one. This new version (v5.1) will be labelled with the keyword system=51 - What are the changes in this new version of ECMWF SEAS5 data?
- A different interpolation tool has been used to produce the 1-degree grid, both for hindcasts and real-time forecasts.
- A new 1-degree grid, now consistent with the grid available from the other participating forecast systems. Specifically, it will have grid-points centered at half-degree latitude/longitude, and hence it has 180 values in the latitude coordinate (from -89.5 to 89.5) instead of the current 181 values (from -90 to 90)
- A couple of additions to complete the list of available variables: Top solar incoming radiation and 1000hPa level for the 5 variables available at pressure levels. Additionally, on top of the values of runoff, for SEAS5.1 both sub-surface and surface runoff will be also available.
- What are the implications for users of ECMWF SEAS5 data?
 From November 2022, only system=51 real-time forecast data will be available from the CDS- Users will need to use
system=51 hindcast data alongside the new real-time forecasts.
Data from the current version (system=5 ) should not be used, so those users with previously downloaded hindcast data will need to download the new version. - At the time of this announcement, hindcast data for October, November and December has been made available on the CDS
- The remaining start dates (from January to September) will be processed and published progressively following the calendar order. Details on their availability can be found in the "Hindcasts" table of the Summary of available data
- Please note that while the ECMWF DHS move hasn't been completed, not all data will be available from the CDS (details in the table above with "DATA AVAILABILITY DURING ECMWF DHS MOVE")
- Why have these changes been introduced?
- When ECMWF SEAS5 was released in 2017, the C3S 1-degree version was created with the default interpolation tool (
emoslib ) available from MARS. With the migration of ECMWF computing infrastructure to its new Data Centre in Bologna, this tool has been discontinued. That means new real-time forecasts produced after the migration can't be produced anymore in a way consistent with the available SEAS5 hindcast in the CDS. After careful evaluation of the impact of the interpolation, it was decided to create a new version of the hindcast data. This has been labelled as SEAS5.1 and encoded with keyword system=51. - With this new version of SEAS5 hindcast, a couple of additional improvements were also included:
- A new 1-degree grid consistent with the one provided for other forecast systems (see details above)
- A couple of additions to the list of variables (see details above).
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