Clouds spread out over the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Ryan Jensen, of Osage, Iowa, fires up Ryno during the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Ryan Jensen in Ryno makes the first run of the night during the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Smoke billows from Nolan Weber’s International as he readies for his run in the SF class of the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

An NTPA official gives the green flag for the next run in the SF class of the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Torque forces the front end of Ryno Reloaded up in the air during the run Osage, Iowa’s Brad Jensen during the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Glencoe, Minnesota’s Doug Christensen, in the Pack Rat 4, kicks off from the starting line during the mod class of the NTPA Tractor Pull Thursday night at the Mower County Fairgrounds. Eric Johnson/photodesk@austindailyherald.com

With ear protection in place, two-year-old Dandon Amundson, of Faribault, takes in the tractor pull action during the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com

Corey Kielmeyer of Nerstrand, Minnesota, thunders down the track during the mod class of the NTPA Tractor Pull Thursday night at the Mower County Fair. Eric Johnson/photodesk@austindailyherald.com