Heat Dome Bakes U.S. Amid Wildfires, Smoke From Canada
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- United States faces extreme heat warnings across multiple regions as a 'heat dome' suppresses cooling, with Billings, Montana hitting 111°F — its hottest day on record.
- Salt Lake City reached an all-time high of 109°F over the weekend, while Boston has seen more 90°F days than average, according to WBUR-FM.
- Cara Schulte of Climate Rights International explained the heat dome traps hot air, prevents cloud formation, and increases health risks due to lack of nighttime cooling, especially for older adults.
- Wildfire activity has surged across the western and central U.S., with about 3.6 million acres burned so far this year and dozens of fires currently active in states including California, Colorado, and Oregon.
- Canada’s wildfires, exceeding 100 blazes, have sent heavy smoke south, giving Toronto the world’s worst air quality and degrading air from Minnesota to New York City.
- Boundary Waters Canoe Area Wilderness was closed Tuesday due to 17 lightning-caused fires, with rangers working to evacuate 6,000–10,000 people from the 1.1-million-acre area.
- National Oceanic and Atmospheric Administration forecasts dangerous heat hazards to persist through next Monday, with California and upper Midwest states at risk early in the week, followed by southern regions.
Why it matters: The convergence of record heat, widespread wildfires, and hazardous smoke creates compounding health risks for millions across two nations. With 3.6 million acres already burned and vulnerable populations exposed to both extreme temperatures and poor air, the strain on emergency services and public health systems intensifies immediately.
