“We’re seeing forms of stress in all of our species of trees,” said Christine Buhl, a forest entomologist with the Oregon Department of Forestry. Trained observers peer outside both sides of the plane, looking for noticeable damage to trees. “You definitely have to have a stomach of steel.”This year, the aerial observation program flew over about 69 million acres of Washington and Oregon forest in about 246 hours. Oregon’s average temperatures have risen about 2.2 degrees Fahrenheit since 1895, according to a 2021 state climate assessment delivered to the state’s Legislature. “It was the combination of the high temperatures in the afternoon with the sun boring down,” said Chris Still, a professor in the College of Forestry at Oregon State University.

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