A report from Wisconsin's Emergency Operations Center says the five were injured in and around Platteville. One person was taken to a local hospital for treatment.
The powerful line of storms generated straight line winds and heavy rain. Nineteen homes are uninhabitable in Verona and 150 additional houses sustained minor damage. In Madison, at least 16 homes have severe damage. Several barns were blown down and homes damaged in Green County's York Township.
The National Weather Service says radar showed a rotation over northern Lafayette and southern Iowa counties about 11 p.m. Monday. Forecasters say a possible tornado initially touched down near Mineral Point, lifted and touched down a number of times between New Glarus and Verona.