Madison, Wisconsin – Wisconsin residents should be prepared for another round of loud cracking and booming sounds Friday as extreme cold lingers and renews the risk of the “exploding tree” phenomenon across much of the state.
According to the National Weather Service, Arctic air remains entrenched over Wisconsin into Friday, with subzero temperatures and bitter wind chills creating ideal conditions for frost cracking. This occurs when sap inside trees freezes rapidly and expands while the outer wood contracts, causing trunks to split suddenly, often with a sharp bang that can sound like a gunshot.
The risk is highest Friday morning across northern and central Wisconsin, including the Northwoods, the Fox Valley, and parts of central counties. Southern Wisconsin, including Madison and Milwaukee-area suburbs, could also experience isolated cracking during the coldest pre-dawn hours, particularly in neighborhoods with mature hardwood trees.
While exploding trees are uncommon, splitting trunks and falling limbs can pose hazards near homes, sidewalks, parked vehicles, and power lines. Residents are advised to avoid standing beneath large trees during extreme cold and to move vehicles away from tree-lined streets when possible.
The same cold driving tree stress also increases the risk of frostbite in minutes, frozen pipes, and vehicle problems. Officials urge limiting time outdoors Friday, dressing in insulated layers, covering all exposed skin, and keeping pets indoors. Warnings and advisories related to extreme cold remain in effect, with additional updates possible if conditions change.
