Environmental News Network - Oregon's Western Cascades Watershed to Experience Larger, More Frequent Fires, PSU Study Finds

Details: By Portland State University; 14.Dec

The Clackamas Basin rarely experiences the intense fire activity that burned in the watershed during the Labor Day fires, but new research out of Portland State University shows that wildfires like the Riverside Fire, which grew to 138,000 acres within days, could become more common under a warming climate, even under non-extreme wind conditions.

Cheryl Porter

The Clackamas Basin rarely experiences the intense fire activity that burned in the watershed during the Labor Day fires, but new research out of Portland State University shows that wildfires like the Riverside Fire, which grew to 138,000 acres within days, could become more common under a warming climate, even under non-extreme wind conditions.

The study found that wildfire hazard in the Clackamas Basin, which is the second largest source of drinking water for the Portland metro area, will likely increase by mid-century. Projected changes in temperature and relative humidity are expected to lead to longer fire seasons and more severe fire weather in Oregon's Western Cascade mountains, which in turn will result in larger, more frequent fires.

"Because of shifts in climate, the scenarios that would create extreme fire events all become a little more plausible," said Andy McEvoy, the study's lead author and a graduate student in environmental science and management. "There will be that many more days under which those components of a fire — ignition, weather and fuel — can align in a terrible way."

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Oregon's Western Cascades Watershed to Experience Larger, More Frequent Fires, PSU Study Finds