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A heatwave of potentially unprecedented proportions for parts of the Pacific Northwest Region, including Oregon, Washington, and British Columbia is now in its early stages of evolving. June high temperature records will likely be shattered across much of the region. Numerous all-time high temperature records will likely be challenged or broken. On Monday, the most populated region in the Pacific Northwest could see widespread temperature anomalies more than 4 standard deviations above the normal figures. A small part of the region could experience temperatures more than 6 standard deviations above normal. Standardized Temperature Anomalies (6/28 18z): Select June, All-Time Records, Forecast Maximum Temperatures: Western sections of Oregon, Washington, and British Columbia, including Portland, Seattle, and Vancouver, will likely see the highest temperatures during the June 26-29 period. Elsewhere, exceptional warmth could persist into the opening days of July. Minimum temperatures will also approach monthly and all-time lows, especially in areas affected by the Urban Heat Island (UHI) effect, namely Portland, Seattle, and Vancouver. Climate change is increasing the frequency, magnitude, and duration of extreme heat events. One important mechanism is through wave resonance events (Mann et al., 2017). If one steps back to a larger hemispheric perspective starting near the beginning of June, one has witnessed the emergence of mega-heat domes in a "whack-a-mole" fashion in the Northern Plains, Southwest, and northern and eastern Europe (including northwestern Russia) that led to record heat, including some monthly or all-time record high temperatures. This latest heat dome is the fourth such major event this month. Updates: Recurrent Rossby Waves, Heatwaves, and Climate Change June 27, 2021: New Canadian National High Temperature Record June 28, 2021: New Canadian National High Temperature Record June 29, 2021: New Canadian National High Temperature Record Unprecedented North American Heatwave Scorches the Pacific Northwest Historic Nature of the Heatwave Attribution Study: 'Virtually Impossible' without Climate Change