This dataset contains ECMWF ERA40 model forecasts of geopotential, temperature, wind and moisture variables on 23 constant pressure surfaces for the period September, 1957 to August, 2002. The forecasts extend out to 36 hours beginning from the 00 and 12 UTC analyses and out to 6 hours beginning with the 06 and 18 UTC analyses. All variables, except moisture, are archived at global T159 spectral resolution in spherical harmonics, while the moisture is archived on a reduced N80 gaussian grid with an approximate horizontal resolution of 125 kilometers. The anlaysis fields have been archived in ds117.1.

The ECMWF ERA40 project is a global atmospheric analysis of many conventional observations and satellite data streams for the period September,1957- August,2002. There are numerous data products that are separated into dataset series based on resolution, vertical coordinate reference, and possible research applications. Descriptions of the series organization and direct links to information about all ERA40 products are available