Hail in Black Hawk County, Iowa

Hail September 15, 2025 · Black Hawk County, Iowa

1.25 in

Hail diameter

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

What the National Weather Service wrote

Spotter submitted picture of hail larger than a quarter north of Irvine Prairie. Delayed report, time and location estimated with radar.

The wider storm

Iowa remained under the influence of a robust thermal ridge across the area, resulting in an unstable environment of 2000-3000 J/kg of MLCAPE but weak shear under 20 kts. There was no focused forcing mechanism in place, however by late afternoon temperatures had warm enough for diurnal thunderstorm development. Despite the lack of shear, one storm did result in half dollar sized hail in Black Hawk County.

Began near La Porte City Arpt (42.3400, -92.3000).

Source: NOAA Storm Events Database, event 1297989. Narratives are written by the National Weather Service forecast office that issued the report.

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