All but about a dozen homes in Spencer, South Dakota, were destroyed in the quarter-mile-wide "wedge" tornado that ground its way through the small farming community of 317 people. It killed 6 people and injured as many as 150 to some degree. Most of the deaths took place in an area of assisted-living apartments for the elderly. A singular, nearly half-mile wide tornadic vortex in Spencer, it would soon become rain-wrapped, grow to almost a mile wide, and break into multiple vortices SE
of town. This was the deadliest, most destructive tornado in South Dakota history. The tornado was one of several in the area that evening. The storm system continued on into Minnesota and Wisconsin, causing power outages to 900,000 people. Roger Edwards of the Storm Prediction Center has prepared a very comprehensive page about this tornado.
The two sunset twisters east of Emery, SD.-------------------------->