Clay,
This is not a response to your question but I thought it may be
helpful information. The Arkansas Red Basin River Forecast Center (ABRFC) provides an archive of hourly gridded precipitation products back to 1993 in a netCDF format for our area of responsibility. This product is a combination of both WSR-88D Nexrad radar precipitation estimates and raingauge reports. We cannot provide any technical support but the information is available for your use. Go to
http://www.srh.noaa.gov/abrfc/ for more information.

Janet