National Weather Service United States Department of Commerce

Severe Thunderstorms and Flash Flooding Threats Continue Saturday in the Plains and Midwest; Hot Holiday for the Southeast

Another day with severe storms, some significant with very large hail and tornadoes, and very heavy rain are expected through Saturday across the Plains and Midwest. In the Ohio Valley, isolated severe thunderstorms with damaging winds and large hail is possible. Heavy rain may produce flooding for the interior Northeast and in the northern California mountains. Building heat wave in the Southeast Read More >

Flood Return Period Calculator

Though this calculator is worded for the flood event return period it would work for any extreme weather event.

 

Enter the return period (ie..100 year flood)

Percent chance of occurrence

year flood %
Enter the number of years (ie..over the next 10 years)
There is a % chance that a year flood will occur over the next year(s)
year(s)