Tomorrow night per the SPC - "As upper forcing increases with the approach of the shortwave trough in tandem with low level frontal forcing, thunderstorms are expected to develop by late afternoon from north-central MN into eastern SD. Low level flow below 700 mb will remain rather weak, and while an isolated supercell is possible, convection will likely develop into clusters or line segments along the cold front. Locally strong gusts and hail will be the main concern with this activity as it shifts east/southeast into western WI/northern IA during the evening."