LOUISIANA — An unexpected deluge hit central Louisiana overnight, with radar estimating nearly 16 inches of rain just northeast of Oakdale. The extreme rainfall came from a small, slow-moving swirl of storms known as a mesoscale convective vortex, which no forecast model predicted. A flash flood warning was issued for the hardest-hit area as heavy rain also spread across parts of Allen, Rapides, and Calcasieu parishes.
Radar Estimates 15.89 Inches Northeast of Oakdale
Radar-estimated rainfall totals reached about 15.89 inches just northeast of Oakdale, making it one of the most extreme rainfall events in the region this year. The heaviest rain fell in a concentrated zone between Oakdale and the area southwest of Alexandria.
A flash flood warning covered this core area, where the rain fell over several hours as storms repeatedly moved over the same spots. Rainfall rates this high can quickly overwhelm drainage systems, creeks, and low-lying roads.
Small Storm Swirl Caught Forecasters by Surprise
The storms organized into a small circulation called a mesoscale convective vortex, a mini swirl that can form within clusters of thunderstorms. Once formed, these features can stall and keep feeding heavy rain into the same location for hours.
No forecast model showed this setup ahead of time, making the event a surprise for forecasters and residents alike. Small-scale features like this are often difficult for models to capture until they are already developing.
Heavy Rain Also Extends Toward Alexandria and Lake Charles
Heavy rain was not limited to the Oakdale area, as radar showed a large band of intense rainfall stretching north toward Alexandria. Totals in this corridor were also significant, with heavy rain covering parts of Rapides Parish overnight.
Another area of heavy rain developed farther southwest toward Lake Charles, with high radar-estimated totals north of the city. Areas farther east, including Opelousas and Lafayette, saw much lighter rainfall by comparison.
Residents Urged to Avoid Flooded Roads
Residents across central and southwest Louisiana should avoid driving through flooded roads, as water depth can be difficult to judge, especially after dark. Just a few inches of moving water can sweep away vehicles and cause serious danger.
Rivers, bayous, and creeks in the region may continue rising even after the rain ends, as runoff drains into larger waterways. Residents near Oakdale and surrounding communities should keep checking local alerts and stay away from flooded areas until water levels fall.
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