A "100-year flood" means a 1% chance of that level of ... For example, Houston, Texas experienced three separate 500-year floods from 2015 through 2017—including Hurricane Harvey, the heaviest ...

Weather forecasters sometimes warn of storms that unleash rains so unusual they are described as 100-year or ... the climate Houston, Texas, was struck by three 500-year flood events from 2015 ...

Weather forecasters sometimes warn of storms that unleash rains so unusual they are described as 100-year or ... the climate Houston, Texas, was struck by three 500-year flood events from 2015 ...

Here’s what to know about how scientists determine how extreme a flood is and how common these extreme events are becoming.