Atlas 14 NOAA

A map showing how much rain is dumped by 24-hour storms with a 1 percent chance of happening each year.

A map showing how much rain is dumped by 24-hour storms with a 1 percent chance of happening each year. Credit: Courtesy / NOAA

A map showing how much rain is dumped by 24-hour storms with a 1 percent chance of happening each year.