Thunderstorm Wind — Clarke, Iowa

2025-09-17 · near Osceola, Clarke, Iowa

Event narrative

Iowa DOT instrument reported a gust of 61 mph. Also received public reports of strong winds in Osceola.

Wider weather episode

Widespread scattered thunderstorms remained in place across northern and central Iowa through much of the day as a surface low approached the area. An axis of 1000-1500 J/kg of MLCAPE developed from southern into central Iowa where clearing allowed for quick heating. Weak shear of 15-20 kts limited more organized thunderstorms development. Storms largely remained sub-severe, however collapsing cores in southern Iowa did result in severe winds gusting over 60 mph and resulting in isolated areas of wind damage.

View location on OpenStreetMap → (41.0300, -93.7900)

Source: NOAA Storm Events Database, event_id 1297895. Narrative written by the NWS forecast office that issued the report.