Ice dam! Yes, it’s a common curse of Wisconsin winters.
Ice dams occur after a heavy snowfall when snow melts over a home’s heated space, runs down the roof, and freezes again over the cold eaves and gutters. Frozen gutters and long icicles are both tell-tale signs.
Ice dams can be prevented by improving attic ventilation which will allow air to circulate and minimize the thaw/freeze cycle, and by improving ceiling insulation which will minimize heat loss.
Installation of electric heating cables on your roof to melt ice and allow water to run off can be a professional solution. For a trustworthy contractor, check with the BBB.