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The term "100-year flood" is often misunderstood—many believe it means a flood that happens once every 100 years, but that’s not how probability works. Instead, it refers to a flood that has a ...

Weather forecasters sometimes warn of storms that unleash rains so unusual they are described as 100 ... year floods. Here’s what to know about how scientists determine how extreme a flood ...

A 100-year storm is a serious weather event with a 1% chance of occurring in any given year. The term “storm” is used to depict both rainfall and flood events, depending on the context.

While the SFHA is a key focus for FEMA and NFIP, it is important to remember that flooding can occur outside these zones as well. Even areas outside the 100-year floodplain can experience flooding, ...