we got almost 3 ft snow here in Maryland. I took a bow rake, also called a potato rake, tied a rope to it and tossed onto roof many times and pulled off snow, to lower the weight and especially at the eaves to stop any "damming" which can cause melt to freeze overnight, creating a dam behind which next day's melt can trap water, which then wicks up under the shingles and drips into the attic. When that happens, you need to chop out the dam at various places along the eaves to allow water to run off, which then form those long icicles. It happened before then creating stains that needed repainting, from a snow that has half that, which was my first knowledge of such a thing. Even if outside temps stay below freezing, there's a heat buildup under the roof snow that causes the melt from underneath, but over the eaves it gets colder and refreezes, creating the dam. Maybe insulation directly attached to the wood under the roof at eaves would help that, but my blown-in type of insulation sure doesn't seem to stop it.