Hail — O'brien, Iowa

2025-09-22 · near Primghar, O'brien, Iowa

Event narrative

Several photos were received of quarter size hail in Primghar.

Wider weather episode

An isolated thunderstorm developed along a slow-moving frontal boundary across northwest Iowa. Seasonally high instability (around 2000 J/kg MLCAPE) and weak shear led to very strong updrafts, producing large hail that caused significant damage to late season crops.

View location on OpenStreetMap → (43.0900, -95.6300)

Source: NOAA Storm Events Database, event_id 1292886. Narrative written by the NWS forecast office that issued the report.