Worldwide precipitation over land has increased by about one percent. The frequency of extreme rainfall events has increased throughout much of the United States. Increasing concentrations of greenhouse gases are likely to accelerate the rate of climate change. Evaporation will increase as the climate warms, which will increase average global precipitation. Soil moisture is likely to decline in many regions, and intense rainstorms are likely to become more frequent.
Sea level is likely to rise two feet along most of the U.S. coast.
Calculations of climate change for specific areas are much less reliable than global ones, and it is unclear whether regional climate will become more variable.