| Episode Narrative |
An isolated, strong storm moving from between just north of Mobridge to just southwest of Mound City generated a strong tornado that was well documented by storm chasers and spotters. Additional, weaker satellite tornadoes and embedded vortices within the main tornado were observed during the 30 minute duration this tornado was on the ground. This resulted in sporadic, intense areas of multi-directional tornado damage, as well as areas of very broad uniform damage. After the main tornado had dissipated, a distinct additional tornado developed southeast of Mound City lasting a few minutes. |
| Event Narrative |
At 7:50 pm CDT, the tornado touched down on the west side of South Dakota Highway 1804, just north of 118th St. Within a few minutes of being on the ground, it tracked east and crossed South Dakota Highway 1804, tossing hay bales in its path. Between 8:00-8:05 pm CDT, the tornado continued in a more southeast direction, crossing 118th St and encountering an electric transmission line, resulting in the collapse of three electrical transmission towers. The tornado then continued east-southeast toward 119th St, where it encountered a farmstead. At this location, multiple trees were broken, snapped, and uprooted. One small shed was lifted, another had its walls collapse, and a machine shed had its doors blown out. The main house lost windows, and a tractor lost its doors facing east and west, although the front and back windshields remained intact. Additionally, a trailer was rolled onto the road, and other farm implements were destroyed or moved. Between 8:05-8:10 pm CDT, the tornado would cross to the south of 119th St, flipping a haybine to the west and through a fence. The main tornadic circulation broadened and tracked east, becoming nearly stationary at times as it traversed over cropland between 299th and 301st Ave. Many smaller tornadic vortices were noted on video accounts during this period. Toward the end of the tornado cycle, between roughly 8:15-8:20 pm CDT, it intensified once again, becoming narrower and tracking from southwest to northeast, crossing 119th St between 301st and 302nd Ave. The track was clearly seen through a corn crop before lifting. Around this same time, a distinct smaller tornado/vortex damaged a farmstead. At this location, a tree was uprooted, a silo was dented, and two shop buildings lost roof panels and doors. Additionally, a travel trailer was rolled 100 feet across 119th St, with debris tossed from north-northeast to south-southwest into a cornfield. Two other smaller tornadic circulations were also noted in the corn crop just west of the intersection of 302nd Ave and 119th St. |
