Interstate Interchange Storm

Actually returning home from a previous storm spotting trip, this storm flared up as I was westbound on Interstate 80 near Iowa City on Tuesday, February 28, 2017. The above image, a Go Pro Hero 4 video frame capture taken around 5:10 pm CST, shows lightning discharge from a cloud seen about one mile east of the Interstate 380 interchange.

A minute later and a mile closer, the cloud grows larger in this Go Pro image at the I-380 exit. The storm cell was located about 10 miles distant, near Oxford, Iowa.

Northbound on I-380 at the North Liberty exit around 5:20 pm. Heavy rain in heavy traffic which included (estimated) penny size hail. 

Radar screen capture of image directly above it. Red area shows more intense part of the storm, and the target icon my position.