Thunderstorm Wind in Decatur County, Iowa

Thunderstorm Wind September 17, 2025 · Decatur County, Iowa

71 mph

Measured gust (62 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

A 71 mph gust at the Lamoni airport.

The wider storm

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.

Began near (30i)lamoni Muni Arp (40.6400, -93.9000).

Source: NOAA Storm Events Database, event 1297894. Narratives are written by the National Weather Service forecast office that issued the report.

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