Hail in O'brien County, Iowa

Hail September 22, 2025 · O'brien County, Iowa

1 in

Hail diameter

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

What the National Weather Service wrote

Several photos were received of quarter size hail in Primghar.

The wider storm

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.

Began near Primghar (43.0900, -95.6300).

Source: NOAA Storm Events Database, event 1292886. Narratives are written by the National Weather Service forecast office that issued the report.

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