This poor tree was damaged in a bad storm, and 4 limbs needed to be removed. Three were properly removed, but you see the one near the top of the photo, with the notch but out of the bottom? It may be that this was the way that the storm damage occurred, but it also the kind of thing that can happen when you fail to make an undercut when you take down a limb. If you do not make an undercut, you can even sometimes see a long, vertical strip of bark that tears off when the limb succumbs to gravity. The notch taken out on the top cut may create an entry point for disease or pests, or the tree may seal it over and be ok. So, if a storm does this, do the best you can. But, if you are pruning, make an undercut to reduce the possibility of further damage!
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