Why I cannot access the most recent data?
Because of the agreed data policy with the data providers, the S2S realtime type of forecast can be accessed only with 3 weeks delay. There should not be any such restriction for the reforecasts.
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What are reforecasts
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?
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Reforecasts are forecasts run using the same model version as
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real-time forecast for a number of past dates
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The way to produce reforecasts is not unique
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. More details in A brief description of reforecasts
How to access S2S data efficiently?
In order to retrieve data efficiently users should follow instructions about S2S reforecasts retrieval efficiency.
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Do you have any examples of S2S data retrieval scripts?
Find links here to efficient retrieval scripts for different S2S datasets via ECMWF Web API.
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Do you provide analysis in S2S?
The S2S database does not contain the analysis used to initialize the S2S models. However, for some models (e.g ECMWF) step 0 is available (see details below), but only for instantaneous variables. For some models (e.g. ECMWF), step 0 of the control forecast corresponds to the unperturbed analysis.
If you are interested in re-forecasts, most re-forecasts are initialized either from JRA, ERA or NCEP re-analysis which can be available from other public datasets.
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What is the starting step of S2S parameters?
The instantaneous variables are archived from step 0, except for some centres (e.g. NCEP or BoM) who start at step=24 because they don't archive step 0 (step 0 has the same value as the re-analysis). Because of that the data at step 0 and step 24 are different and step=0 corresponds to the initial conditions.
For accumulated variables (e.g. total Precipitation), step 0 is usually not archived because its value is equal to 0 and step=24 corresponds to the accumulation during the first 24 hours.
For daily averaged variables, there is no step 0.
For MJO RMMS, the calculation for all models starts from step=24 (first common time step for all the models). It uses instantaneous winds at 850 and 200 hPa at step=24h and OLR accumulated over the first 24 hours
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Is there an issue with accumulated fields at day 16 in IFS (ECMWF) model?
Read the explanation in Issues with data.
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- In this case reforecasts are produced at the same time as the real-time forecasts.
- Each reforecast refers to a real-time forecast.
Main Concepts
Realtime Date
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Model Version Date
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Hindcast Date
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Examples
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reforecast
configuration
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realtime
date
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model version
date
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reforecast
length
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reforecast
frequency
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number of hindcast
dates available for a
model version date
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hdate=19810101/19810106/19810111/19810116/19810121/19810126/../
20131201/20131206/20131211/20131216/20131221/20131226
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