On the continental scale, the findings based on the radar network are qualitatively similar to results based on rain gage or thunderstorm observations. However, regional and smaller-scale features observed in the phase and amplitude of the diurnal cycle are not documented in the literature. These features include a prominent minimum in the amplitude of the diurnal cycle in Texas, an apparent lake breeze influence southwest (upwind) of Lake Michigan and Superior, a sea/land breeze signal along the Gulf coast and Atlantic seaboard, and a tendency for rainfall to peak at progressively later times eastward from the Appalachian Mountains. The latter aspect echoes a better-known pattern seen on a larger scale in the lee of the Rocky Mountains. Systematic phase shifts apparently due to mountain-valley circulations are also evident within the Rocky Mountain cordillera itself. In addition to the diurnal cycle, the geographical distribution of the second harmonic (semi-diurnal) signal will also be presented.