The precipitation estimates provided are derived from the National Weather Service (NWS) WSR-88D Doppler Radars. Radar precipitation estimates can be grossly inaccurate, so radar-based precipitation values are calibrated with routinely available surface gauge data. The combined product provides the spatial resolution of radar with the increased accuracy of surface gauge networks. These gauge-calibrated radar estimates are known as Multi-Precipitation Estimates, or MPE.
However, due to the limits of the NWS radars and the surface gauge networks, there can still be large errors with MPE, especially with local estimates.
This site allows you to view MPE maps for every month recorded.
