Ice storms are very very rare in Wisconsin, I am happy for that. People don’t understand how heavy ice is and that even an inch of it can bring down power lines and tree branches.
Down this way (Oklahoma and Texas), we usually get our ice storms in the Spring. When they come at this time of year, though, they are especially damaging.
In the Spring, the sap is flowing in the trees and they are more resilient. In mid-winter, there is no sap...and the trees are extremely brittle.
I recall the Great Ice Storm of New Year's Eve, 1978 in Dallas/Fort Worth. Trees virtually disintegrated under the weight of the ice. Twenty-thirty foot trees had split in half and were laying on the ground. Power was out for over a week. The roads were all closed and the cities were at a complete standstill.
Worst single weather event I've ever experienced.