Thunderstorm Wind — Osceola, Iowa

2025-06-11 · near Sibley, Osceola, Iowa

Event narrative

Wind initially hit severe levels at 1300CST with a peak wind of 83 mph recorded at 1310CST at mesonet station RSYI4 near Sibley.

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 → (43.4300, -95.7100)

Source: NOAA Storm Events Database, event_id 1278297. Narrative written by the NWS forecast office that issued the report.