Forecasters warn an extreme winter storm could trigger rare “exploding trees” across the Upper Midwest as temperatures plunge ...

It turns out that trees can actually explode when temperatures drop.

While the Wisconsin DNR says ‘exploding’ may be an exaggeration, there is a risk for frost cracking. That happens when the sap inside a tree gets below freezing, and expands.

Experts say it’s extremely rare, but not completely unheard of.