Page "European Centre for Medium-Range Weather Forecasts" Paragraph 17

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.