UNDATED - A few severe thunderstorms are possible later this (Thursday) afternoon as a frontal boundary slides through the region.  The main threat will be large hail, with damaging winds and possibly a brief tornado.  The best chance will be near the Iowa/Minnesota border.

Additional rounds of thunderstorms are possible Friday afternoon through Sunday.  A few of these storms may be severe.  The best chance will remain in southern Minnesota.

Resources
National Weather Service
WJON.com Weather Page