Thunderstorm Wind — Sully, South Dakota

2025-07-14 · near Clifton, Sully, South Dakota

Event narrative

The Sully County Sheriff reported multiple powerlines were downed by an estimated 100 mph thunderstorm wind gust west of Onida.

Wider weather episode

Scattered thunderstorms produced isolated strong winds and damage across central and north-central South Dakota during the evening of July 14th. A collapsing storm produced 82 mph winds measured by the Pierre Regional Airport Automated Surface Observing System, resulting in tree and vehicle damage on the east side of town. Another storm west of Onida would go on to topple multiple powerlines with an estimated 100 mph wind gust. Multiple reports of wind gusts of 50 to 70 mph were observed through the evening and overnight hours. As the thunderstorms departed, a second round of strong, non-thunderstorm winds followed the system overnight into July 15th.

View location on OpenStreetMap → (44.7100, -100.2400)

Source: NOAA Storm Events Database, event_id 1263303. Narrative written by the NWS forecast office that issued the report.