EF1 tornado in Pottawattamie County, Iowa

According to researchers tracking this storm, who were using DOW - a mobile radar system, this brief tornado touched down around 2 miles west southwest of exit 72 on Interstate 29 and lifted about 1/2 mile east of the exit. The tornado downed 1 tree but did little other damage. Besides being visually seen by the researchers, it also produced a tornadic signature on the DOW system.

A very strong and unseasonably cold upper level low pressure system that was tracking across the northern plains brought a strong low level jet to the region during the early morning hours of June 11th. The warm and unstable air that worked north into the region helped spawn early morning severe thunderstorms across eastern Nebraska and southwest Iowa. Later that day as the upper level system worked into the central Dakotas, a cold front pushed across the region. This helped set off another round of thunderstorms that developed over east central Nebraska by late afternoon.

Isolated small supercell thunderstorms initially developed ahead of the cold front over eastern Nebraska, but they were quickly overtaken by a broken line of larger supercell thunderstorms, some of the heavy precipitation type, that developed along the cold front. Cell mergers and training were observed well into the evening hours as the activity quickly spread across southwest Iowa. The storms produced a total of 8 confirmed tornadoes in the Omaha/Valley warning area which covers eastern Nebraska and southwest Iowa.