We started the day out in Kearney, NE and made our way east and north towards Sioux City, IA. As we were travelling between Omaha and Sioux City, I was keeping an eye on a cluster of storms moving northward through eastern Nebraska. Made it to Sioux City and decide to head west into Nebraska to watch the strongest looking cell to see if it might do something. We sat near Ponca, NE and watched this cell for a while, but it wasn't looking like much. We couldn't follow it any farther because of the river so we crossed into SD at Vermillion. By this time, the cell we were watching became tornado warned and I'm pretty sure is the one that produced the Inwood tornado. We hung out in the southeastern corner of SD for a while to see if any of the cells moving through would strengthen enough to merit chasing, but this never happened. We did get some pretty strong outflow as a severe cell north of Sioux City collapsed in front of us. We followed some showers a little ways up I-29 hoping something might develop. Didn't happen, so we gave up on the day and started to head back home.
We eventually jumped on US 20 at Holstein, IA, and I decided to check my phone because those clouds in front of us looked pretty interesting. To my surprise, I saw two red boxes about 40 miles in front of us. We switched drivers quick so I could see what was going on, and decided we might be able to catch the southern cell, which at this time was about to move through Lake City. We caught up to the storm after it had already crossed the highway and saw a few funnels as it moved toward Manson. I can't confirm a tornado as it was 5-10 miles away, but there was a report in Manson around this time, so maybe we did see one. We got off the highway, drove into Manson and watched the meso spinning around, but it never produced anything more. We got back on the highway and continued the drive home. Got there around 2am for a good four or five hours of sleep before getting up for work. Considering we had completely given up on the day, I can't believe that we managed to run into what we did, even though we may have not actually seen a tornado.
Here's our video from the Manson storm. Nothing terribly interesting, although some pretty nice structure.