A climatology of heavy midlatitude rainfall across the United States from 1949–2000
A subset of observations from the U.S. Historical Climatology Network for the same domain and new regions helps identify heavy, significant, and extraordinary rainfall events. Precipitation values within 500 km of tropical events are not used. These event definitions are based on the 90th or higher percentile of total precipitation events with at least 25 mm (1 inch) of rainfall as well as the number of heavy events in each PCA-defined region. Further decadal, regional, and seasonal event categorizations uncover meaningful trends in the heavy, significant, or extraordinary event classifications.