Hail in Monona County, Iowa

A report from mPING of 3.5 inch hail.

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.