The strong storms that stranded cars and caused structural damage to at least 75 homes in Wisconsin last Friday were caused by several tornadoes, according to a preliminary report by the National Weather Service.

The severe weather was triggered by a surface low-pressure system and cold front across the upper Midwest which drew unusually high moisture into the region, with dew points climbing into the lower 60s into central Wisconsin, the weather service said.

The combination of high moisture and the cold front created fast-moving supercell storms.

The NWS confirmed several tornadoes resulted in structural damage. Local emergency management in Weston confirmed damage to homes and mobilized fire department units to the scene. Up to 75 houses in Ringle were also damaged.

The storms produced isolated areas of large hail, including a report of 1.50-inch hail near Marshfield.

Heavy rainfall, ranging from 1-4 inches, caused localized flooding. In Marshfield where 2.65 inches of rain fell, emergency dispatchers reported multiple vehicles stranded in deep water on city streets.