Weather forecasters sometimes warn of storms that unleash rains so unusual they are described as 100-year or even 500-year floods. Here’s what to know about how scientists determine how extreme a ...

Central Texas, known as Flash Flood Alley, experienced several 100-year rainstorms last year, as did Florida, with a scattershot of points dated as occurring during the Atlantic hurricane season.

Federal regulators repeatedly granted appeals to remove Camp Mystic’s buildings from their 100-year flood map, loosening oversight as the camp operated and expanded in a dangerous flood plain in ...

In response to an appeal, FEMA amended the county's flood map in 2013 to remove 15 of the camp’s buildings from the hazard zone. Records indicate that those buildings were part of the 99-year-old Camp ...

FEMA approved requests to lift flood restrictions on Camp Mystic buildings for years, enabling expansion in a known hazard zone before the July 4 flash floods killed at least 27 people.

More information: Chunhong Li et al, Adaptive capacity for multimodal transport network resilience to extreme floods, Nature Sustainability (2025). DOI: 10.1038/s41893-025-01575-z ...

This is what forecasters mean when they talk about a 100-year flood By: Isabella O'malley, The Associated Press Posted: 2:55 PM CDT Wednesday, Apr. 2, 2025 Last Modified: 7:52 AM CDT Thursday, Apr ...