The NSSL has released an app for mobile devices as part of their Precipitation Identification Near the Ground project (more information available here: http://www.nssl.noaa.gov/projects/ping/). As the app description states, the project goal is to help refine radar algorithms, including the Hydrometeor Classification Algorithm, by receiving ground reports from all sorts of locations in real-time, not just at airports. While the HCA is useful, it obviously is bound by the lowest radar elevation s