The Environomental Verification and Analysis Center (EVAC), located at the University of Oklahoma, adds data analysis and quality-assurance techniques to the surface raingauge data sets. One of the goals of EVAC is to validate remote sensing data and in situ data to provide researchers with a better understanding of error characteristics of the data sets which they use.

The Global Precipitation Climatology Project (GPCP) is an element of the Global Energy and Water Cycle Experiment (GEWEX) of the World Climate Research program (WCRP). GPCP was established to provide mean monthly precipitation on a 2.5 x 2.5 degree latitude -longitude grid for the purpose of validating general circulation and climate models, studying the global hydrological cycle, and diagnosing the variability of the global climate system.

The Office of Global Programs (OGP) leads the NOAA Climate and Global Change (C&GC) Program . NOAA has the primary responsibility within the Federal Government to routinely provide climate forecasts and products to the Nation. OGP assists in this capacity by sponsoring focused scientific research, within approximately eleven research elements, aimed at understanding climate variability and its predictability. Through studies in these areas, researchers coordinate activities that jointly contribute to improved predictions and assessments of climate variability over a continuum of timescales from season to season, year to year, and over the course of a decade and beyond.

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