National Weather Service United States Department of Commerce

Ian Forecast to be a Major Hurricane Entering the Gulf of Mexico; Threats to Florida

There is a risk that Ian will bring dangerous storm surge, hurricane-force winds, and heavy rainfall along the west coast of Florida and the Florida Panhandle by the middle of this week. Flash and urban flooding is possible with rainfall across the Florida Keys and the Florida peninsula through the middle of the week. Residents in Florida should ensure they have their hurricane plan in place. 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)