Extreme weather experienced here in 2015 will become routine, study predicts
2015, the warmest year on record for the Northwest, caused crop losses, fish die-offs, large wildfires, and irrigation shortages, and we better get used to it.
A new federal report on the impacts of climate change released Friday includes a chapter on the Pacific Northwest, warning that more years like 2015 may lie ahead for the region and they may be even worse.
"I wish I could say that year was an anomaly, but it is likely that those conditions will become more and more frequent," said Philip Mote, director of the Oregon Climate Change Research Institute at Oregon State University and a co-author on the Pacific Northwest chapter. "Unless we rapidly reduce the amount of carbon we're putting into the atmosphere on a global basis, we will increasingly experience extreme weather events – and the Northwest will not be exempt," Mote said.
The report is the fourth National Climate Assessment under the U.S. Global Change Research program and the first since 2014. Representatives from 11 federal agencies constitute the Subcommittee on Global Change Research of the Committee on Environment and Natural Resources within the National Science and Technology Council.
The Northwest chapter included authors from Oregon, Washington and Idaho representing universities, state and federal agencies, Native American tribes, and private industry.
"Although we are looking at same great challenges in the future – especially if we have repeated years like 2015 – there are things resources managers, businesses and citizens can do to increase their resilience to climate change," said chapter lead Christine "Kris" May of Silvestrum Climate Associates.
In 2015, the annual average temperature in the Northwest was 3.4 degrees warmer than the 30-year average. Winter was worse, with temperatures averaging 6.2 degrees above normal. The report notes that "the warm 2015 winter temperatures are illustrative of conditions that may be considered 'normal' by mid-century."
As a result of the high temperatures and sparse precipitation, snowpack levels in Oregon and Washington were the lowest on record: Oregon was 89 percent below average, Washington, 70 percent. This "snow drought" led to lower river levels that affected many farmers, who received reduced allocations of water for irrigation or had their water shut off early. In Eastern Oregon's Treasure Valley, for instance, farmers received only a third of their normal irrigation water because the Owyhee Reservoir received inadequate river inflows to fill the reservoir for the third year in a row.
Among the other impacts of 2015:
• Estimated agricultural losses were between $633 million and $773 million in Washington alone, with heavy losses in blueberries, red raspberries and the dairy industry;
• The combination of low snowpack and extreme precipitation deficit in spring and summer led to the most severe wildfire season in Northwest history, with more than 1.6 million acres burning in Oregon and Washington;
• Hoodoo Ski Area in the Oregon Cascades closed for the season in mid-January, experiencing its shortest season in 77 years of operation;
• Low stream levels and warm water resulted in fish die-offs in the Columbia and Snake River basins.
"The skiing industry is being hit hard by climate change because what used to fall as snow around the 5,000-foot level increasing is falling as rain," said Mote, who was a lead author on two Intergovernmental Panel on Climate Change (IPCC) reports. "The difference between a low snowfall year and a high snowfall year in the Northwest equates to 2,100 fewer employees and a $173 million reduction just in ski resort revenues."
The researchers say some of the adaptation methods being looked at in the Northwest include vintners experimenting with different varieties of wine; timber companies planting more drought- and heat-resistant trees; and farmers utilizing flexible cropping methods, conservation tillage and dryland farming techniques. More cities and counties are including climate change mitigation in their planning.
"The more planning for adaptation and mitigation the better," Mote said, "but there are some supreme challenges – especially for isolated communities, tribal communities and others that rely on natural resources. Water availability, water quality and infrastructure are foundational issues moving forward."
Federal agencies involved in the U.S. Global Change Research Program are: the Departments of Agriculture; Commerce; Defense; Energy; Health and Human Services; the Interior; State; and Transportation; and the U.S. Environmental Protection Agency (EPA), National Aeronautics and Space Administration (NASA), National Science Foundation, Smithsonian Institution, and U.S. Agency for International Development.
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