![Millions to face the record-breaking heat dome over the Pacific Northwest this week, as heatwave brings new extreme all-time heat records for the United States and Canada Millions to face the record-breaking heat dome over the Pacific Northwest this week, as heatwave brings new extreme all-time heat records for the United States and Canada](https://www.severe-weather.eu/wp-content/uploads/2021/06/heat-dome-record-breaking-heatwave-pacific-northwest-canada-united-states-historic-event.jpg)
Millions to face the record-breaking heat dome over the Pacific Northwest this week, as heatwave brings new extreme all-time heat records for the United States and Canada
![Heat dome: What is the extreme weather pattern causing record temperatures and wildfires? | Climate News | Sky News Heat dome: What is the extreme weather pattern causing record temperatures and wildfires? | Climate News | Sky News](https://e3.365dm.com/21/08/768x432/skynews-graphic-heat-dome-climate_5467099.jpg?20210803163443)
Heat dome: What is the extreme weather pattern causing record temperatures and wildfires? | Climate News | Sky News
![Deadly once in 10,000-year heat dome grips Canada with 230 dead as temperatures climb to record 121F | Daily Mail Online Deadly once in 10,000-year heat dome grips Canada with 230 dead as temperatures climb to record 121F | Daily Mail Online](https://i.dailymail.co.uk/1s/2021/06/30/14/44867775-0-image-a-12_1625061364250.jpg)