<P> ECMWF makes significant contributions to support research on climate variability, pioneering an approach known as reanalysis . This involves feeding weather observations collected over decades into a NWP system to recreate past atmospheric, sea - and land - surface conditions over specific time periods to obtain a clearer picture of how the climate has changed . Reanalysis provides a four - dimensional picture of the atmosphere and effectively allows monitoring of the variability and change of global climate, thereby contributing also to the understanding and attribution of climate change . </P> <P> To date, and with support from Europe's National Meteorological Services and the European Commission, ECMWF has conducted two major reanalyses of the global atmosphere: the first ECMWF re-analysis (ERA - 15) project generated reanalyses from December 1978 to February 1994; the ERA - 40 project generated reanalyses from September 1957 to August 2002 . </P> <P> ECMWF's operational forecasts are produced from its "Integrated Forecast System" (sometimes informally known in the United States as the "European model") which is run every twelve hours and forecasts out to ten days . </P> <P> It includes both in a "deterministic forecast" mode and as an ensemble . The deterministic forecast is a single model run that is relatively high in both resolution but also in computational expense . The ensemble is relatively low (about half that of the deterministic) in resolution and so in computational expense, so less accurate . But it is run 51 times in parallel, from slightly different initial conditions to give a spread of likelihood over the range of the forecast . </P>

What is the name of the european weather model