The session will focus on precipitation measurement/estimation with a eye on historical, high resolution, gridded, hourly, daily and subdaily precipitation (re-)analysis. Recently, significant research interest has focused on multi-sensor (gauge-radar-satellite-model) fusion procedures for hi-resolution regional precipitation We are hoping to continue discussions on: (1) the current status of precipitation data set development; (2) the current and future requirements for the data sets; (3) how to produce precipitation products that serve the research community while benefiting operations and service activities; (4) demonstrate successful uses of these products; and (5) describe multi-sensor data fusion processes. Contacts: Pingping Xie (pingping.xie@noaa.gov), Thomas Adams (thomas.adams@noaa.gov).