Daily data
You will find two CDS catalogue entries for daily and subdaily data. The output of the different available forecasting systems is available both for real-time forecasts (from 2017 onwards) and retrospective forecasts or hindcasts for the period 1993-2016.
There is available one dataset containing surface (or single level) parameters and another one with variables in a set of pressure levels spanning from 925 hPa to 10 hPa
01. Originating Centre
Select the name of the institution responsible of the forecasting system of your interest
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 bear in mind that you must pair up your forecasts with the relevant hindcasts by using the same "system" for both of them.
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 data available depending on your selection of forecast or hindcast years.
Please bear in mind 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 among "originating centres".
You can find more details about the production schedules in the CDS documentation for the seasonal forecast datasets.
07. Leadtime Hour
Select the lead-time(s) you are interested in. This is the offset in hours since the initialization date.
Bear in mind that some variables are available every 6 hours, and some others every 24 hours. You will find the full list in the "Overview" tab of this CDS form and in the link to the "Detailed list of parameters" available in the "Documentation" tab
Note that the length of the outputs is at least 6 calendar months, but it may differ between "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 requests in the CDS.
An experimental netCDF conversion can be accessed by using the CDS API. You can find some related information in the "Recommendations and efficiency tips" link available 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
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 there are available the ingredients to calculate the forecast monthly anomalies: the forecast ensemble mean and the hindcast climate mean.
The output of the different available forecasting systems is available both for real-time forecasts (from 2017 onwards) and retrospective forecasts or hindcasts for the period 1993-2016.
There is available one dataset containing surface (or single level) parameters and another one with variables in a set of pressure levels spanning from 925 hPa to 10 hPa.
Post-processed data
You will find two CDS catalogue entries for real-time forecast monthly anomalies, both for each system ensemble mean and for every individual ensemble member.
Note that anomalies are just available for real-time forecasts start dates (from 2017 onwards)
There is available one dataset containing surface (or single level) parameters and another one with variables in a set of pressure levels spanning from 925 hPa to 10 hPa.
