This circulation was centered over the low level convergent area and at the intersection of the outflow boundary with the storm core. A BWER is a significant severe weather signature because it represents a very strong, rotating updraft which helps circulate the hailstones and allow them to grow. This view shows 4 slices of reflectivity through the storm with increasing elevation from panel 1 to panel 4. To the southwest of this convergent area you can also see divergence at low levels located just to the northeast of the radar site with weak approaching velocities and strong receding velocity. After the storm struck EROS it continued to move northeast into Pipestone, Moody, and Rock counties producing large hail.
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