The heat wave appeared due to an exceptionally strong ridge centered over the area, whose strength was linked to the effects of climate change. It also affected inland regions of Central and Southern California, Northwestern and Southern Nevada and parts of Montana, though the temperature anomalies were not as extreme as in the regions farther north.
The heat wave affected Northern California, Idaho, Western Nevada, Oregon, and Washington in the United States, as well as British Columbia, and in its latter phase, Alberta, Manitoba, the Northwest Territories, Saskatchewan, and Yukon, all in Canada. Extreme event attribution found this was a 1000-year weather event, made 150 times more likely by climate change, but a study in Nature Climate Change estimated it was a 200-year event. The 2021 Western North America heat wave was an extreme heat wave that affected much of Western North America from late June through mid-July 2021. around 600 excess deaths in the United States.Deadliest weather event in the history of Canada.Air temperature anomalies across North America on June 27, 2021, compared to 2014–2020 baselineĤ9.6 ☌ (121.3 ☏), recorded at Lytton, British Columbia
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