Worsening wildfires in recent years have led officials to embrace planned fires to thin forests before disaster strikes. But the warming world is making it tougher to do safely.
A new study found that the dangerous pairing of disasters may become more common in the American West as rains trigger runaway surges of mud and debris in areas damaged by wildfire.
The blaze, known as the NCAR fire, at its peak led to the evacuation of 19,000 people near Boulder. Officials said there were no injuries or structures damaged.