Unzipped structure play in the northeast Colorado grasslands. Checked into hotel early at Sterling, CO and waited for convection along the dry trough/cold front intersection to form over the Colorado grasslands near Raymer, CO. Sat in Raymer for a bit, and watched storms unzip and mature west of Raymer. Found a nice perch on a ridgeline southwest of Raymer where we watched a beautiful crisp convective structure put on a nice lightning display. Sat and lapsed for what seemed like a couple hours. Trying to reroute after dark east and northeast we suffered a flat tire. Changed and made it to Sterling for overnight. Tire replaced next morning at local tire shop (log by WSA).