Flash Flood — Harrison, Iowa

2024-06-12 · near California Jct, Harrison, Iowa

Event narrative

Emergency Management relayed a delayed report of severe crop damage and crop fields washed out. Additionally, several county roads along with Easton Trail Road had around a foot of flowing water over them by the time the rain stopped falling. Department of Secondary Roads had crews out the following day fixing damage to county roads from the flood.

Wider weather episode

On June 12th, a low-amplitude shortwave embedded in northwesterly flow aloft ejected out into the central Great Plains. At the surface, a surface low-pressure was noted in North Dakota with a cold front extending south into South Dakota. Ahead of this cold front, a surface trough extended from south-central Nebraska into northeast Nebraska. Isolated thunderstorms developed on this surface trough late in the afternoon across far northeast Nebraska. These storms quickly intensified and dove south-southeast along the Missouri River. While a brief tornado was observed near Decatur, Nebraska, the more impactful hazard from these storms were the large hail they produced. Long swaths of golf ball to baseball sized hail fell along and just west of the Missouri River during the evening hours with these storms, including in the Omaha metro where baseball sized hail fell from downtown south into Bellevue.

View location on OpenStreetMap → (41.8525, -95.9742)

Source: NOAA Storm Events Database, event_id 1198302. Narrative written by the NWS forecast office that issued the report.