Floods are one of the most common hazards in the United States and may occur during any month of the year in Louisiana. A flood is defined when water overflows onto normally dry land. Not all floods are alike; they happen on different scales of space and time. The main types of floods are:
Flooding events in Louisiana have been caused by the remnants of tropical storms and hurricanes, and before Hurricane Katrina, storms like Hurricane Audrey in 1957 and Hurricane Betsy in 1965 caused significant flooding across portions of the state. The direct and indirect impacts of heavy rains from convective storms and low-pressure systems have caused flooding along the Mississippi River Basin, including in floods in 1927, 1937, 1973 and 2019. You can learn more about some of these events through NOAA’s Flood Safety page for Louisiana.