Thunderstorm Wind — Brown, South Dakota

2025-08-15 · near Groton, Brown, South Dakota

Event narrative

Public reported tree damage by estimated thunderstorm winds around 60 mph.

Wider weather episode

Strong storms during the early morning hours of August 15th would generate winds in excess of 70 mph at Sunset Colony, and half-dollar to ping pong sized hail observed by the Marshall County Emergency Manager in Britton. Total rainfall in Britton over a 48 hour period exceeded 4.5 inches, with this latest round of storms overwhelming drainage systems and causing flooding in town.

View location on OpenStreetMap → (45.4700, -98.0400)

Source: NOAA Storm Events Database, event_id 1290364. Narrative written by the NWS forecast office that issued the report.