As winter sets in across the United States, severe cold weather raises concerns about trees potentially exploding. While social media has circulated warnings about this phenomenon, experts clarify the truth behind “exploding trees.”
Do Trees Really Explode in Extreme Cold?
Bill McNee, a forest health specialist for the Wisconsin Department of Natural Resources (DNR), explained that extreme cold can lead to frost cracks in trees. These cracks can appear suddenly due to the freezing of tree sap, which expands as temperatures drop.
Understanding Frost Cracks
Frost cracks are vertical splits that can form on a tree’s trunk or branches. They occur when the outer layer of the tree cools faster than its inner wood. This difference in temperature causes the bark to shrink unevenly, resulting in cracks. McNee noted that this phenomenon is common in thin-barked trees, such as:
- Maples
- Lindens
- Sycamores
While these cracks can produce a loud sound similar to a gunshot, it’s extremely rare for a tree to actually explode. Instead, frost cracks become a part of the tree, and the living tissue can often heal over time.
Potential Risks and Safety Measures
However, frost cracks can pose safety risks. Severely cracked trees may become unstable and could fall. McNee advises that anyone noticing significant cracks should consult an arborist for a proper assessment.
Common Winter Weather Effects
Beyond frost cracks, other unusual winter phenomena include:
- Thundersnow: Snowstorms accompanied by thunder.
- Pancake Ice: Round, flat disks of ice forming in turbulent waters.
- Snow Rollers: Cylindrical snow formations created by wind.
- Frost Quakes: Ground cracks resulting from freezing and expansion of subsurface water.
Forecast for Severe Cold
From January 22 to January 26, an arctic front is expected to bring frigid temperatures to the middle and eastern United States. Wind chill factors could plunge as low as -60°F in states like Illinois and Minnesota. Many areas will experience wind chills averaging around -10°F, while the southern states may see chills between 10°F to 20°F.
This winter, as awareness of tree safety increases, understanding frost cracks and their implications can help mitigate risks in extreme cold. Stay informed through reliable sources to navigate these conditions safely.
