The western U.S. mountains, typically covered in snow by March, are noticeably barren this year due to a recent heat dome. This early snowmelt is concerning as it signals a potentially severe fire season according to climatology professor John Abatzoglou from the University of California Merced. The heatwave, which persisted through late March, brought temperatures well above normal, breaking records and rapidly melting the snowpack across the region.
A recent study highlighted the unusual warmth of this heatwave, attributing it to climate change caused by human CO2 emissions. The high temperatures shattered March records in over a dozen states, exacerbating the risk of wildfires. Research indicates that an early snowmelt can lengthen the fire season by drying out the landscape, leading to increased fire ignition and spread.
As of Monday, snowpack levels in western U.S. ski destinations were on track to hit record lows, according to climate scientist Daniel Swain from the University of California Los Angeles. This diminished snowpack trend extends beyond ski resorts, with Abatzoglou noting that snow levels in most western states are the lowest seen in decades.
In Colorado, where research scientist Jared Balik resides, the snowpack hit a record low this winter and has nearly disappeared by late March. This rapid melting has given an early start to the wildfire season in states like Colorado and Nebraska, where fires have already scorched thousands of hectares.
Reports of wildfires have also emerged in California, signaling that the dry conditions are conducive to fire propagation. The unseasonably warm temperatures in central California have led to vegetation browning and heightened fire risks, prompting concerns among experts.
Balik’s research underscores how reduced snowpack can fuel more intense wildfires. The decline in snowpack leads to drier trees, making forests more susceptible to severe fires that can destroy entire ecosystems. This shift in fire severity could alter landscapes and impact carbon storage, water availability, and wildlife habitats.
Despite the grim outlook, Balik suggests that every winter presents an opportunity to build up snowpack, mitigating fire risks. While climate change may lead to more low-snow years, weather phenomena like El Niño can bring snowy winters intermittently. In these snowy years, prescribed burning can help reduce fuel loads, making wildfires less severe and easier to manage.
In Canada, low snowpack poses a significant wildfire risk, especially in the western regions. Factors such as heat and drought can also contribute to fire hazards, as seen in recent severe wildfire events. With ongoing drought conditions and the forecasted impact of El Niño in 2026, many parts of Canada remain vulnerable to intense fire seasons.
The widespread heatwave in the western U.S. has heightened concerns about the scope of potential wildfires. Abatzoglou expressed hope for precipitation in April to mitigate the existing fire risk and prevent a devastating fire season.
