Rare 1,000-Year Rainfall Event Soaks Pearl River County
Meteorologists confirm that over 19 inches of rain fell in six hours near Crossroads, exceeding the statistical threshold for such an event by nearly eight inches.
By Ivan Dvorak ·
Pearl River County recorded a rainfall total of more than 19 inches in six hours on Halloween night, a figure that the National Weather Service confirms exceeds the criteria for a 1,000-year event. The agency defines this specific statistical threshold for the region as 12 inches of precipitation over the same six-hour period. The measured rainfall in parts of the county approached 20 inches, marking a deviation of nearly 8 inches above the benchmark that occurs with a 0.1% probability in any given year.
The intensity of the downpour led the National Weather Service to issue a Flash Flood Warning with a rare "catastrophic" designation. This tag indicates a flood event capable of causing severe damage and posing a direct threat to human life. The alert triggered Wireless Emergency Alerts, which pushed warnings directly to cell phones in affected zones to urge residents to seek higher ground.
Local authorities report that no injuries were sustained during the event. By Sunday morning, the Mississippi Highway Patrol and the Pearl River County Sheriff’s Office confirmed that no major traffic disruptions remained. Storm reports detailed specific impacts, including a flooded home on Buckbranch School Road near Humphrey Road. Debris was observed floating in the rapidly moving water, and a high-water rescue was conducted on Humphrey Road, approximately four miles northeast of Crossroads.
The West Hobolochitto River near McNeil also experienced rapid changes, with water levels rising by approximately 12 feet overnight. The river reached moderate flood stage before leveling off. While the rainfall itself was a 1,000-year event, meteorologists note that actual flooding depends on local drainage, soil saturation, and watershed size, meaning the rain does not automatically guarantee a 1,000-year flood.
The extreme precipitation was driven by an active jet stream pattern interacting with warm Gulf waters and a strong El Niño system. This atmospheric setup created conditions suitable for high moisture retention and extreme rainfall rates. The storm also affected other areas, with Metairie receiving eight inches of rain in three hours, a total classified as a 100-year event with a 1% annual probability.
