Life‑Threatening Flash Flooding Threatens Central Gulf Coast as Arthur’s Remnants Fuel Torrential Rain

Overview

• The Weather Prediction Center says life‑threatening and locally catastrophic flash flooding is ongoing on the Central Gulf Coast and that additional rounds of heavy rain remain likely today.
• Flash flood emergencies were issued after radar and mesonet data showed morning totals above 9 inches with multiple measurements over 11 inches in Avoyelles Parish, Louisiana and Pearl River County, Mississippi.
• The extreme rainfall is tied to the remnant low of Tropical Storm Arthur, strong low‑level inflow and very high precipitable water values near or above 2.2–2.4 inches that fuel intense, efficient precipitation.
• Mesoscale drivers including convergent rain bands, outflow boundaries and mesoscale convective vortices have produced training storms with bursts of 2–4 inches per hour and instantaneous rates as high as 7 inches per hour, a pattern reinforced by HRRR, HREF, REFS and RRFS guidance.
• Because soils are saturated at or above the 95th–98th percentile and 3‑hour flash‑flood guidance is as low as 1–2 inches, urban areas and low‑lying roadways face rapid flooding now and emergency services should expect renewed warnings and localized rescues as storms continue to move across MS, AL, LA and the FL Panhandle.