Hail in Story County, Iowa
Hail May 19, 2025 · Story County, Iowa
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Pea to nickel sized hail with a few stones up to quarter sized.
The wider storm
A warm front lifted out of Missouri and into Iowa in the late afternoon, with convection continuing through the evening. Instability of around 1000 J/kg of MLCAPE and effective shear values of 30-40 kts were sufficient to produce hail up to golf ball sized as they moved north along the I-80 corridor. Later that evening storms grew upscale but diminished in strength. Several personal weather stations then reported gusts of 60-65+ mph on the dry side of stratiform, non thunderstorm, rain areas. This was likely due to evaporative processes along the edge of the precipitation areas.
Began near Zearing (42.1600, -93.2800).
Source: NOAA Storm Events Database, event 1253699. Narratives are written by the National Weather Service forecast office that issued the report.
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