Flash Flood — Minnehaha, South Dakota

2025-09-16 · near South Sioux Falls, Minnehaha, South Dakota

Event narrative

Significant street flooding was reported near the Sioux Empire Mall on South Louise Avenue as well as areas west of Interstate 29 near Marion Road south of 41st Street.

Wider weather episode

A nearly stationary thunderstorm developed and dissipated over southwestern Sioux Falls along a converging set of outflow boundaries from earlier thunderstorm activity. With less than 10 knots of deep-layer shear and an extensive warm-cloud depth, torrential rainfall occurred with 1 to 2 inches in less than an hour. Brief large hail also occurred at the onset of heavy rain.

View location on OpenStreetMap → (43.5126, -96.7927)

Source: NOAA Storm Events Database, event_id 1292617. Narrative written by the NWS forecast office that issued the report.