In 2003 the International Precipitation Working Group (IPWG) began a project to validate operational and semi-operational satellite rainfall estimates over Australia and the US in near real time. A European verification page was added in 2004. On June 2006, the Cooperative Institute of Climate Studies (CICS) at the University of Maryland started a new validation page devoted to the South American region (http://cics.umd.edu/~dvila/web/SatRainVal/dailyval.html).
This study is focused on the results of large-scale validation of daily rainfall estimates over Del Plata basin for 2005. The retrieval of nine different satellite precipitation estimates, based on IR, passive MW and merging techniques, are compared against daily accumulations on 0.25° x 0.25° areas (accumulation period starting at 12:00Z) using a gauge analysis for this region. A masking scheme was applied to the resulting grids based on a minimum distance threshold to the nearest gauge. For comparison purposes, 1-day forecasts from a limited number global and regional numerical weather prediction models are also included in the statistical analysis.