2. Heavy precipitation is becoming more intense and more frequent across most of the United States, particularly in the Northeast and Midwest.
3. Increases in the intensity or frequency of heavy precipitation are key factors that affect the
Just as water is fundamental to life, precipitation is integral to society and ecosystems. Ecosystems, human systems, and human practices have evolved to fit the expected patterns of precipitation intensity, amount, and timing. This indicator focuses on the observed changes in the intensity aspect of precipitation.
This indicator represents the percent change in the precipitation amount occurring as very heavy precipitation. It does this by comparing two periods, a reference period of 1901–1960 and a more recent period of 1986–2016. A positive
Extreme precipitation is related to
The information presented here is relevant to decisions about retention of surface water for flood
This indicator is provides valuable evidence of the expectation that heavy precipitation will increase for most parts of the United States.