A powerful atmospheric river began affecting Rio Grande do Sul, Brazil on April 29, 2024, resulting in massive flooding across the region. By early May 6, 2024, the storm affected 334 of the state’s 496 cities, including the capital Porto Alegre, claimed at least 75 lives, left over 100 people missing, and impacted more than 1 million residents. This severe weather event is described as the most disastrous in the state since 1941, surpassing previous records in terms of both scope and damage.