Daily data
You will find two CDS catalogue entries labelled 'daily data'; these contain data at daily or subdaily frequency (6h or 12h) . The output of the different forecasting systems is available both for real-time forecasts (from 2017 onwards) and retrospective forecasts (referred to as hindcasts) for the period 1993-2016.
One dataset contains surface (or single level) parameters, the other contains variables on 11 pressure levels spanning 925 hPa to 10 hPa.
01. Originating Centre
Select the name of the institution the forecasting system of your interest originates from.
02. System
Select the version of the forecasting system. This is a numeric label and the available values are different for the different "originating centres". Note that for a given start date you could find more than one system available for a single "originating centre".
Please note that you must pair up your forecasts with the relevant hindcasts by using the same "system" for both of them. A full description of the use of the system keyword is available from the "Documentation" tab.
03. Variable
Select the parameter(s) you are interested in.
04. Year
Select the year of the initialization date of the model run(s) you are interested in.
Note that there could be differences in the options available depending on your selection of forecast or hindcast years.
Please note that you must use the hindcast data in order to make a meaningful use of the forecast data. And remember you must pair forecasts and hindcasts up by using the same "system" for both of them.
05. Month
Select the month of the initialization date of the model run(s) you are interested in.
06. Day
Select the day of the initialization date of the model run(s) you are interested in.
Note that due to different production schedules, the available dates may differ between hindcasts and forecasts and between "originating centres".
You can find more details about the production schedules in the "Documentation" tab.
07. Leadtime Hour
Select the lead time(s) you are interested in. This is the time, in hours, from the initialization date.
Bear in mind that some variables are available every 6 hours, and some every 24 hours. You will find that information in the full list of available parameters from the "Documentation" tab and also in the summary table shown in the "Overview" tab of this CDS dataset.
Note that the length of the outputs is at least 6 calendar months, but it may not be the same for all "originating centres".
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08. Format
You can select the data format for your data retrieval.
Currently, just GRIB format is available for C3S seasonal forecast datasets.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Documentation" tab.
09. Terms of Use
You must accept the terms and conditions of the Copernicus User Licence in order to access the C3S seasonal forecast data.
01. Originating Centre
Select the name of the institution the forecasting system of your interest originates from.
02. System
Select the version of the forecasting system. This is a numeric label and the available values are different for the different "originating centres". Note that for a given start date you could find more than one system available for a single "originating centre".
Please note that you must pair up your forecasts with the relevant hindcasts by using the same "system" for both of them. A full description of the use of the system keyword is available from the "Documentation" tab.
03. Variable
Select the parameter(s) you are interested in.
04. Pressure Level
Select the pressure level(s) for the variables you are interested in.
05. Year
Select the year of the initialization date of the model run(s) you are interested in.
Note that there could be differences in the options available depending on your selection of forecast or hindcast years.
Please note that you must use the hindcast data in order to make a meaningful use of the forecast data. And remember you must pair forecasts and hindcasts up by using the same "system" for both of them.
06. Month
Select the month of the initialization date of the model run(s) you are interested in.
07. Day
Select the day of the initialization date of the model run(s) you are interested in.
Note that due to different production schedules, the available dates may differ between hindcasts and forecasts and between "originating centres".
You can find more details about the production schedules in the "Documentation" tab.
08. Leadtime Hour
Select the lead time(s) you are interested in. This is the time, in hours, from the initialization date.
Note that the length of the outputs is at least 6 calendar months, but it may not be the same for all "originating centres".
...
09. Format
You can select the data format for your data retrieval.
Currently, just GRIB format is available for C3S seasonal forecast datasets.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Documentation" tab.
10. Terms of Use
You must accept the terms and conditions of the Copernicus User Licence in order to access the C3S seasonal forecast data.
Monthly data
You will find two CDS catalogue entries for monthly statistics: monthly average, minimum, maximum and standard deviation are available for all initialization dates. Additionally, for real-time forecast initialization dates you will find the ingredients to calculate the forecast monthly anomalies: the forecast ensemble mean and the hindcast climate mean. The output of the different forecasting systems is available both for real-time forecasts (from 2017 onwards) and retrospective forecasts (referred to as hindcasts) for the period 1993-2016.
One dataset contains surface (or single level) parameters, the other contains variables on 11 pressure levels spanning 925 hPa to 10 hPa.
01. Originating Centre
Select the name of the institution the forecasting system of your interest originates from.
02. System
Select the version of the forecasting system. This is a numeric label and the available values are different for the different "originating centres". Note that for a given start date you could find more than one system available for a single "originating centre".
Please note that you must pair up your forecasts with the relevant hindcasts by using the same "system" for both of them. A full description of the use of the system keyword is available from the "Documentation" tab.
03. Variable
Select the parameter(s) you are interested in.
04. Product Type
Select the monthly product you are interested in.
Note that your retrieved data will consist of all available individual ensemble members, except for the products based on each forecasting system ensemble (ensemble mean and hindcast climate mean).
05. Year
Select the year of the initialization date of the model run(s) you are interested in.
Note that there could be differences in the options available depending on your selection of forecast or hindcast years.
Please note that you must use the hindcast data in order to make a meaningful use of the forecast data. And remember you must pair forecasts and hindcasts up by using the same "system" for both of them.
06. Month
Select the month of the initialization date of the model run(s) you are interested in.
Note that in the current setup all monthly products are encoded using as nominal start date the 1st of each month, regardless of the real initialization date. You can find more information about how nominal start dates are assigned in the "Documentation" tab.
07. Leadtime Month
Select the lead time(s) you are interested in. This is the time, in months, from the initialization date.
Note that the convention used for labelling the data implies that leadtime_month=1 is the first complete calendar month after the initialization date. In the current setup of all datasets that means that for a forecast initialised on the 1st of November, leadtime_month=1 is November.
08. Format
You can select the data format for your data retrieval.
Currently, just GRIB format is available for C3S seasonal forecast datasets.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Documentation" tab.
09. Terms of Use
You must accept the terms and conditions of the Copernicus User Licence in order to access the C3S seasonal forecast data.
01. Originating Centre
Select the name of the institution the forecasting system of your interest originates from.
02. System
Select the version of the forecasting system. This is a numeric label and the available values are different for the different "originating centres". Note that for a given start date you could find more than one system available for a single "originating centre".
Please note that you must pair up your forecasts with the relevant hindcasts by using the same "system" for both of them. A full description of the use of the system keyword is available from the "Documentation" tab.
03. Variable
Select the parameter(s) you are interested in.
04. Pressure Level
Select the pressure level(s) for the variables you are interested in.
05. Product Type
Select the monthly product you are interested in.
Note that your retrieved data will consist of all available individual ensemble members, except for the products based on each forecasting system ensemble (ensemble mean and hindcast climate mean).
06. Year
Select the year of the initialization date of the model run(s) you are interested in.
Note that there could be differences in the options available depending on your selection of forecast or hindcast years.
Please note that you must use the hindcast data in order to make a meaningful use of the forecast data. And remember you must pair forecasts and hindcasts up by using the same "system" for both of them.
07. Month
Select the month of the initialization date of the model run(s) you are interested in.
Note that in the current setup all monthly products are encoded using as nominal start date the 1st of each month, regardless of the real initialization date. You can find more information about how nominal start dates are assigned in the "Documentation" tab.
08. Leadtime Month
Select the lead time(s) you are interested in. This is the time, in months, from the initialization date.
Note that the convention used for labelling the data implies that leadtime_month=1 is the first complete calendar month after the initialization date. In the current setup of all datasets that means that for a forecast initialised on the 1st of November, leadtime_month=1 is November.
09. Format
You can select the data format for your data retrieval.
Currently, just GRIB format is available for C3S seasonal forecast datasets.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Documentation" tab.
10. Terms of Use
You must accept the terms and conditions of the Copernicus User Licence in order to access the C3S seasonal forecast data.
Post-processed data
You will find two CDS catalogue entries for real-time forecast monthly anomalies; each contains the anomalies for the ensemble mean for each system and the individual ensemble members.
Anomalies are just available for real-time forecasts start dates (from 2017 onwards).
One dataset contains surface (or single level) parameters, the other contains variables on 11 pressure levels spanning 925 hPa to 10 hPa.
