Thunderstorm Wind in Lyon County, Iowa

Thunderstorm Wind June 11, 2025 · Lyon County, Iowa

85 mph

Estimated gust (74 kt)

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

What the National Weather Service wrote

A roof was blown off a hog barn.

The wider storm

As a subtle mid-level impulse worked eastward across the region, a couple of multicell thunderstorm clusters developed during the early to mid afternoon across northwest Iowa near and to the north of the surface boundary. With mixed-layer instability of 1500-2000 J/kg and deep-layer shear of 35-40 knots, organized storms developed and utilized an inverted-V thermodynamic profile to accentuate a swath of damaging wind gusts near and just south of Iowa State Highway 9.

Began near Rock Rapids Muni Arp (43.4600, -96.1100).

Source: NOAA Storm Events Database, event 1278305. Narratives are written by the National Weather Service forecast office that issued the report.

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