Via Tony Heller at RealClimateSceince.com: "The NOAA/EPA graph is being touted by Democrats as proof that people who tell the truth about climate need to be jailed. It is intended to mislead people into believing that heavy rainfall events are due to your SUV."
Climate Change Indicators: Heavy Precipitation | Climate Change Indicators in the United States | US EPA
The EPA graph itself is fraudulent. Had they extended their graph back to the start of records in 1895, the trend would have been the exact opposite. Cherry picking starting points of graphs is standard operating procedure.‘