Flash Flood — Sioux, Iowa

2025-07-30 · near Maurice, Sioux, Iowa

Event narrative

As a result of intense rainfall, the Floyd River near Struble rose nearly 8 feet in 3 hours to flood stage.

Wider weather episode

Thunderstorms erupted within a very moist and unstable environment across central South Dakota during the afternoon of July 29 in response to an approaching upper level short-wave from Colorado. These thunderstorms quickly grew upscale into a line, producing 55 to 75 mph wind gusts across southeast South Dakota and extreme northeast Nebraska, resulting in isolated tree damage. In addition, prolonged heavy rain resulted in some localized flash flooding across northwest Iowa.

View location on OpenStreetMap → (42.9264, -96.1787)

Source: NOAA Storm Events Database, event_id 1288298. Narrative written by the NWS forecast office that issued the report.