I was disappointed to find extensive mid level clouds engulfing much of western SD by late morning, so after getting a satellite and sfc obs update I shot east on I-90 to Kadoka where better insolation was in place.  I later traveled south on HWY 73 to HWY 18 and watched an outflow boundary and sfc trough in far northern NE light up a few Cu.  This photo shows the boundary in the distance with some photogenic fragmented cirrus.

A soft Cb popped ~120mi to my south and later a much stronger Cb (later SVR near Faith) erupted north by about the same distance.  Great, I had targeted in between two zones of initiation--never a reassuring feeling!  I debated dropping into NE, but some stout Mdt Cu farther west along the Black Hills caught my eye so I shot west and hoped they'd organize.