This dataset contains the Net tendencies from parameterized processeses. There are 4 variables in this dataset, each of which are on the original 60 hybrid model levels on the reduced N80 Gaussian grid. The data are accumulated over the 3 and 6 hour forecasts for the 00, 06, 12 and 18 UTC analyses

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