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ARPS uses fine-scale NEXRAD Doppler radar data and other observations to generate forecasts at three resolutions: 32-km intervals for national forecasts; 9 km for multistate regions (1782 km x 1782 km); and 3 km for local areas (594 km x 594 km). Above is a 24-hour ARPS forecast for January 23, 1999, at 6 a.m. (CST). Below is the actual radar observation.      page 3 Terms for using data resources. CD-ROM available. Credits and Acknowledgments for WW2010. Department of Atmospheric Sciences (DAS) at the University of Illinois at Urbana-Champaign. page 4