Extreme heat this far north is particularly dangerous as these locations have a lot less experience with temperatures that high.
One of, if not the, worst heat wave in the region’s modern records impacted the Pacific Northwest of the United States and western Canada during late June 2021, not just breaking records but smashing them over an incredibly hot four-day period. And unlike the heat wave across the Southwest United States in mid-June, this time the dangerous heat was felt across a region not known for such extremes.
A week after a heatwave broke records across the Southwest and northern Mountain West, a second, even more anomalous, heatwave occurred across the Pacific Northwest and Western Canada. It sent records toppling. Over a four-day period, June 26-29, daytime high temperatures skyrocketed to well over 100 degrees Fahrenheit, setting all-time records at dozens of locations.
Portland, Oregon’s, average high temperature over this period was 112 degrees Fahrenheit, the hottest three-day period on record by an astonishing 6 degrees. All three days—108 on June 26, 112 on June 27, and 116 on June 28—set all-time heat records for the city. Seattle, Washington, also had back-to-back days that set all-time heat records: 108 on June 28 after reaching 104 the day prior. In fact, in the previous 126 years, Seattle had only hit 100 degrees three times. It reached that mark in three consecutive days in June!
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