According to a preliminary analysis you can find reported on at https://www.climate.gov/news-features/event-tracker/preliminary-analysis-concludes-pacific-north

According to a preliminary analysis you can find reported on at https://www.climate.gov/news-features/event-tracker/preliminary-analysis-concludes-pacific-northwest-heat-wave-was-1000-year https://www.climate.gov/news-features/event-tracker/prelimin..., current models say that the event was a 1/1000 year heatwave with global warming, and a 1/150,000 year event without. Those numbers are extreme enough to make me question whether the model's tails are heavy enough, but yeah. It basically wouldn't have been possible without global warming.