
Wind shear stripping out weakly attached and already-dead branches, plus ice loading in winter storms. Species that shed readily do most of the volume across central Indiana yards — silver maple, willow, Siberian elm and box elder are overrepresented in every pile.
Branches, split limbs, twigs and matted leaves strewn across the lawn, fence and beds, possibly a snapped top somewhere in the mix. The important observation is not on the ground: look up into the canopies the debris came out of, and trace any wire crossing the property before anyone starts dragging.