Flash Flood — Lyon, Minnesota

2025-07-18 · near Marshall, Lyon, Minnesota

Event narrative

Video showed flowing water roughly one foot deep across U.S. Highway 59 near the intersection of MN Highway 23.

Wider weather episode

A cluster of thunderstorms developed north of U.S. Highway 14 near the South Dakota-Minnesota border during the evening of July 18. These thunderstorms drifted south and east along a slow-moving surface boundary and began to train/back-build across the Marshall, MN area. Four to eight inches of rain fell within 2 to 3 hours, resulting in significant flash flooding across the city, especially for areas south and east of downtown.

View location on OpenStreetMap → (44.4423, -95.7693)

Source: NOAA Storm Events Database, event_id 1287240. Narrative written by the NWS forecast office that issued the report.