"Erratic" storm motion could be explained from the vertical wind shear perspective. Right-movers were more dominant than left-movers - consistent with the clockwise turning shear vectors in the lowest 3 km of the hodograph. Vertical wind shear relatively "weak" for supercells [0-6km bulk shear = 14.5 m s-1 0-6km total shear = 33.5 m s-1] Note: you need to make sure you have enough shear before you apply the concept of predicting supercell motion.