Hello; My guess is the sort of "ice storm" being discissed is the "freezing rain" sort. During the winter in parts of the USA the temperature conditions are such that upper level warm air layers generate rain that is cold but not cold enough to be sleet or snow. The rain can hit onto very cold surfaces, well below freezing, such as tree branches, power lines, road surfaces and all other surfaces. For example the rain hits a tree branch that is well below freezing. It forms a thin layer of ice. Over time the ice layer builds up to the point the branch cannot support the weight. The branch breaks and takes out power lines. This sort of thing will be happening over a broad area and often results in many power lines going down at the same time. The road surfaces also get a layer of ice making it very difficult for road crews to drive about.
These freezing rain events have happened to me a few times. There is the potential for one in my area before the weekend. A rain event followed by a snow event with a prediction of up to eight inches of additional snow. We got over six inches yesterday.
I spent the afternoon removing snow from my back awning. I also installed a wood burner this past summer and spent some time cutting kindling in case the power goes out.