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.

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

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.

Meteorologists link polar vortex cold snaps to exploding trees, noting limited risk to people but greater danger from falling branches and damaged trunks.