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FILE - In this June 30, 2021 file photo Missoulians cool off in the Bitterroot River as temperatures crested 100 degrees Fahrenheit in Missoula, Mont. The Pacific Northwest is bracing for another major, multi-day heat wave in mid-August 2021 just a month after temperatures soared as high as 116 F in a record-shattering heat event that killed scores of the most vulnerable across the region. (AP Photo/Tommy Martino, File)