The coldest air of the season is set to slide over the Philadelphia area this weekend, which could lead to frost quakes, ice quakes and lake quakes.

Local arborist Luke Brunner says that low temperatures are far less dangerous to trees than heavy snow and ice.

Experts say trees do not explode but can crack loudly due to rapid temperature changes. This phenomenon, known as "frost cracking," occurs when tree sap freezes and expands. Young trees, thin-barked ...