The historic extremity of the event serves as a warning for other regions. During the summer of 2021, an unprecendented heatwave swept across western North America, affecting regions from British Columbia to Washington, Oregon, and beyond into other interior areas that typically experience a mild c
Lead author Karen Heeter takes a core sample from an old mountain hemlock near Crater Lake, Oregon, where at least one tree dated to the 1300s. Credit: Grant Harley/University of IdahoDuring the summer of 2021, an unprecendented heatwave swept across western North America, affecting regions from British Columbia to Washington, Oregon, and beyond into other interior areas that typically experience a mild climate.
Summer seasonal temperature anomalies revealed by tree rings and modern weather data, 1950-2021. Credit: Modified from Heeter et al.,The tree-ring reconstruction and modern temperature readings show that 1979-2021 saw a sustained period of hot summers unrivaled for the last 1,000-plus years. Most of the hottest years have occurred since 2000.
The summer 2021 western North America heat wave. Redder colors represent higher temperature anomalies; white X’s indicate sites where researchers took tree-ring samples to put it into a long-term context. Credit: Modified from Heeter et al.,Heeter and her husband and a few colleagues collected about half of the samples for the study during the summers of 2020 and 2021, from high-elevation sites in national forests and parks.
Center, a Douglas fir in the Tahoma Creek vicinity of Washington’s Mt. Rainier National Park, from which the authors took a core sample. Credit: Grant Harley/University of Idaho
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