July 21 Johnson County Tornado Warning

Still located at the Interstate 380 rest area just south of Cedar Rapids, Iowa and just north of the Swisher exit, the severe storm cell in Johnson County on Friday, July 21, 2017 was progressing.
This image, captured at 4:46 pm CDT, shows an extensive shelf cloud stretching west from the intense center of the cell.

Meanwhile, toward the center of the cell one minute later, things were getting interesting. This image shows a lowering with an intense rain-wrapped area where I was sure a tornado might form.

4:48 pm. Panorama looking south toward Johnson County as seen from the rest area.

4:49 pm. Zoomed-in version of the image above this one. Note the turbulent low hanging clouds along the southern horizon in the background. This was captured right as, or just before a tornado warning was issued for Johnson County, with the towns of Kalona and Hills later being effected. Nikon D7200 DSLR camera.

4:50 pm. Radarscope Pro capture of the moment, showing my position (blue target) and the tornado-warned box in red.