Researchers at Utah State University and other institutions have published a study in Science Advances formally characterizing a type of heat wave phenomenon known as “snow eaters.” These events occur when temperatures remain above freezing continuously for multiple days, typically three to five, and result in rapid snowpack disappearance in the Western United States.
The study found that snow eaters have become increasingly prevalent in recent decades. Since the 1850s, the area affected by these heat waves has expanded by approximately 40,000 square miles per century, and the first occurrence of such events each season has shifted earlier by about one month per century. These accelerating trends are attributed to overall climate warming patterns affecting the region.
While the term “snow eater” has historical roots dating to at least the 1880s when it referred to warm chinook winds, the recent scientific formalization comes after a notable event earlier this year when an early heat wave rapidly eliminated snowpack across the Colorado Rockies and California’s Sierra Nevada. Researchers note that solar radiation interacts with elevated temperatures to amplify snowmelt, as warming snow crystals lose their reflective properties and absorb more sunlight.
The consequences of accelerated snowmelt extend beyond water management concerns. Rapid depletion of winter snowpack affects water availability during drier summer months and contributes to drought stress in mountain forests, potentially intensifying wildfire conditions. Additionally, snow-eater events may create hazards for recreation and infrastructure through avalanches, glacial instability, and permafrost degradation, though scientists continue investigating these connections.
Experts emphasize that improved predictive capabilities regarding snowpack dynamics could assist water managers in resource planning and preparation for early or excessive runoff events that complicate reservoir and stream management throughout the Western United States.
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