The U.S. East Coast, in particular, has seen the largest increases in the number of flood days.
Heavy downpours have become more frequent as global warming intensified since the middle of the 20th century. Increased precipitation has been linked to a warming-induced shift from snow to rain. As air gets warmer it can also hold more water vapor and release more rain.
Flooding is becoming more frequent along the U.S. coastline.
The intensity of extreme precipitation events is projected to increase in a warmer climate.