More than 11,300 people are confirmed to have died in the floods that struck eastern Libya on September 11, 2023, far surpassing many estimates of the death toll in the country’s 2011 civil war. Thousands are still missing. Flooding has washed away approximately 25% of the city of Derna, and damage to roads and bridges is curtailing emergency service access. A rapid attribution study estimated that the extreme rain was at least a “1-in-300 year event.” This is far beyond previously recorded incidents, yet such incidents are now up to 50 times more likely—and up to 50% more intense—when compared to a 1.2°C cooler climate.