On June 22, 2012, TVN storm chasers documented an amazingly photogenic tornado near the town of Fall River, in the southwestern corner of South Dakota. With "non-zero" probabilities that day, the chance of seeing a tornado anywhere in the country was a real long shot. Despite these odds, and with a little "high plains magic," the team's reward for great targeting and persistence came in the form of one of their all-time best chases. For more on their incredible chase day, visit http://www.tvnweather.com/ondemand
Source: [Man vs. Storm, Episode 2] Needle in a haystack: The Fall River, SD tornado (Youtube).