The ECMWF calculates weather developments several times a day for the coming days using numerical models. For the purposes of this modelling, data is continually collected and collated from national monitoring networks all around the globe. The ECMWF provides the world's most accurate weather model for medium-range forecasts for 3 to 15 days ahead. These computations serve as the basis for national forecasts:
- Model calculations optimised for a few days ahead
- Medium- and long-range weather forecasts
In addition, these calculations are also used for climate research. The researchers have invested a great deal of effort over the past few years into producing monthly and seasonal outlooks. This involves calculating the average, rather than actual, weather patterns.