Predicted changes in the annual number of days of extreme rainfall across the United States by 2041-2070 as compared to 1971-2000 if greenhouse gases continue to increase at a high rate. By mid-century, some places could experience two or more additional days per year on which the rainfall totals exceed the heaviest rains historically experienced in the area. Maps by NOAA, based on downscaled CMIP3 multi-model data provided by Katharine Hayhoe.  Original story.