The National Atmospheric Deposition Program (NADP) provides this report (.pdf format) entitled "Nitrogen in the Nation's Rain." The report describes the nitrogen cycle (atmospheric nitrogen pathways), human activities that contribute to nitrogen levels, the role of agriculture (through fertilizers), effects on aquatic systems, and measurements of nitrogen deposition. In addition, the report...

The California Department of Water Resources's Division of Flood Management provides this series of real-time maps representing rainfall over California and Western Nevada. The color, .gif maps, available as either large-scale or detailed regional maps, show one-hour, six-hour, or twenty-four-hour rain gage readings (in inches).