The canopy will tend to get more of a triangular or more pointed at the top shape.
Okay, here's another thought. First I'm presuming you're using the organic program. If not, then even a nice Shumard Red will have trouble in our white rock/Alkalai Clay soils. Anyhow, presuming you're on the natural program, one thing that can make a Shumard do that is wet feet. They don't like too much water, and if you've been watering the lawn a bit on the heavy side, the tree can act like this. It's obviously not too bad or the leaves would have dropped prematurely, and clearly they didn't since they hung on to turn nice and red today.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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