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Map showing much hotter than normal conditions across the Pacific Northwest and British Columbia on June 27. Credit: Weathermodels.com

The extraordinary heat wave that's stifling the Pacific Northwest reached its peak in many areas on Monday. Seattle smashed its all-time high-temperature record, set just the day before, by 4°F.

Why it matters: After two days of oppressive heat and little relief at night, the extreme weather event, boosted by global warming, is moving into a more dangerous phase.

  • Heat illness tends to spike the longer heat waves last, and extreme heat is the No. 1 weather-related killer each year in the U.S.

Driving the news: A highly unusual weather pattern that statistically has less than a 1-in-several-thousand-year chance of occurring is in place over the Pacific Northwest, with a record-strong high-pressure area aloft — colloquially known as a "heat dome" — sitting over Washington state and British Columbia.

  • This heat dome is yielding temperatures 25–50°F above average across multiple states and British Columbia.
  • This heat, combined with a worsening drought, is raising the risk of wildfires across multiple Western states, with some large blazes erupting in California Sunday and Monday.
  • It is also causing power demand to spike at a time when hydropower resources are lower than usual.
  • The heat was so severe Monday that pavement buckled across the Seattle and Portland metro areas.

By the numbers: All of Oregon, Washington and Idaho, plus portions of California, Montana and Nevada, are under excessive heat watches and warnings.

  • Portland, Oregon, set an all-time high temperature of 112°F on Sunday, and eclipsed that on Monday, with a high of 115°F.
  • In Seattle, the temperature reached 104°F on Sunday, which broke the existing all-time record. It exceeded this on Monday, reaching 108°F.
  • Before this weekend, Seattle had never had back-to-back 100-degree days, and only saw three such days on record. But now, the century mark was exceeded three days in a row.
  • A preliminary state record of 118°F was tied in Dallesport, Washington.
  • Canada is also seeing extreme heat, with the country's June high-temperature record tied on Saturday and smashed on Sunday at Lytton in British Columbia by nearly 3°F, with a high of 116°F. This was broken again Monday, with the same location recording 117.5°F.

Of note: To put this into perspective, this means that a location in British Columbia, not known as an extremely hot province in June, equaled Las Vegas' all-time hottest temperature.

  • Mountain areas in the Northwest have been extremely warm with freezing levels located above the peak of Mount Rainier at times. This is resulting in rapidly melting snow and ice, from the peaks of Oregon to the mountains of British Columbia.

How it works: There are three main reasons the Pacific Northwest is so hot. The first is tied to the heat dome itself, which causes air to sink, or compress, warming as it does so and keeping skies clear. The second has to do with the location of the heat dome.

  • The feature is parked to the north-northeast of the region, at the same time as an upper-level low-pressure area lurks offshore.
  • Due to the clockwise flow of air around the high pressure, easterly winds are blowing from high-to-low elevation areas, adding even more compressional heating.

The third fact is climate change. Studies have shown that severe heat events such as this one are now on average about 3–5°F hotter than they would be without the many decades of emissions of greenhouse gases from fossil fuel burning, deforestation and other human activities.

  • However, this understates climate change's influence, researchers told Axios, as warming is also thought to be altering weather patterns in a way that makes strong heat domes more common and prolonged.
  • Climate scientists warn that this event demonstrates how climate change plus natural weather variability are pushing society beyond our ability to cope.

What they're saying: "We have made trillions of small adaptations to optimize our society for the historical range of temperature, precipitation, etc., that we have experienced," Andrew Dessler, a climate researcher at Texas A&M University, told Axios via email.

  • "As the climate changes, that range is no longer the relevant one, and the mismatch between what we are adapted for and what we actually experience can generate huge negative impacts that seem to suddenly appear out of nowhere — even though we've been predicting them for literally decades," he said.
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Go deeper

Over 230 medical journals: Climate crisis is the "greatest" health threat

Floodwaters remain in Helmetta, New Jersey, on Aug. 22 following flash flooding as Tropical Storm Henri swept through. Nearly 1 in 3 Americans have experienced a weather disaster since June —  showing the extent to which climate change is impacting people's daily lives. Photo: Tom Brenner/AFP via Getty Images

Global warming is affecting people's health — and world leaders need to address the climate crisis now as it can't wait until the COVID-19 pandemic is over, editors of over 230 medical journals warned Sunday evening.

Why it matters: This is the first time so many publications have come together to issue such a joint statement to world leaders, underscoring the severity of the situation — with the Lancet and the British Medical Journal among those issuing the warning.

Miriam Kramer, author of Space
2 hours ago - Science

All-civilian Inspiration4 is back on Earth after flight to space

A side-by-side of the Inspiration4 crew and a shot of their capsule on the way back to Earth. Photo: SpaceX

The all-civilian Inspiration4 crew is back on Earth after their three-day mission in orbit.

The big picture: The launch and landing of this fully amateur, private space crew marks a changing of the guard from spaceflight being a largely government-led venture to being under the purview of private companies.

28 U.S. citizens depart Afghanistan on Qatar Airways flight

Passengers board a Qatar Airways aircraft bound to Qatar at the airport in Kabul on September 10, 2021. Photo: Aamir Qureshi/AFP via Getty Images

The State Department on Saturday confirmed that a Qatar Airways charter flight left Kabul on Friday with 28 U.S. citizens and seven lawful permanent residents on board.

The big picture: Friday's flight is the third such airlift by Qatar Airways since the Taliban takeover of Afghanistan, AP reports.