Thunderstorm Wind — Lyon, Iowa

2025-06-11 · near Edna, Lyon, Iowa

Event narrative

A machine shed and empty grain bin were destroyed by thunderstorm winds, which also tipped over a semi-truck.

Wider weather episode

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.

View location on OpenStreetMap → (43.4400, -96.0200)

Source: NOAA Storm Events Database, event_id 1278315. Narrative written by the NWS forecast office that issued the report.