Sign up for our daily briefing

Make your busy days simpler with Axios AM/PM. Catch up on what's new and why it matters in just 5 minutes.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on the day's biggest business stories

Subscribe to Axios Closer for insights into the day’s business news and trends and why they matter

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Stay on top of the latest market trends

Subscribe to Axios Markets for the latest market trends and economic insights. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sports news worthy of your time

Binge on the stats and stories that drive the sports world with Axios Sports. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Tech news worthy of your time

Get our smart take on technology from the Valley and D.C. with Axios Login. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Get the inside stories

Get an insider's guide to the new White House with Axios Sneak Peek. Sign up for free.

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Denver news?

Get a daily digest of the most important stories affecting your hometown with Axios Denver

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Des Moines news?

Get a daily digest of the most important stories affecting your hometown with Axios Des Moines

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Twin Cities news?

Get a daily digest of the most important stories affecting your hometown with Axios Twin Cities

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Tampa Bay news?

Get a daily digest of the most important stories affecting your hometown with Axios Tampa Bay

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Want a daily digest of the top Charlotte news?

Get a daily digest of the most important stories affecting your hometown with Axios Charlotte

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Sign up for Axios NW Arkansas

Stay up-to-date on the most important and interesting stories affecting NW Arkansas, authored by local reporters

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Please enter a valid email.

Please enter a valid email.

Subscription failed
Thank you for subscribing!

Firefighters try to extinguish flames from the Dixie Fire near Chico in Greenville, Calif., on Thursday. Photo: Neal Waters/Anadolu Agency via Getty Images

Forecasters are warning Americans to brace for another extreme heat wave this week, as 107 large wildfires burn across nearly 2.3 million acres of the U.S. West.

Driving the news: "Widespread air quality alerts and scattered Red Flag Warnings stretch from the Northwest and Northern Rockies to the High Plains, as well as throughout parts of central California," the National Weather Service said Sunday.

"It's going to be a real oppressive week with dangerous heat and hot conditions across much of the U.S. Excessive heat watches are up across much of the Pacific Northwest for mid to late week, including in the Portland and Seattle metro areas. Meanwhile, heat advisories are in effect for a good part of the south-central U.S. and parts of western New York state."
— NWS

State of play: The massive wildfires were burning across 15 states on Sunday —with weather conditions already dangerous in several places, according to the National Interagency Fire Center.

  • The Dixie Fire, California's second-biggest wildfire in the state's history, is the largest blaze now burning in the U.S. It has destroyed 627 buildings, damaged 42 other structures and razed 489,287 acres as of Sunday night.
  • "Near critical conditions with wind gusts up to 45 mph were reported over north central Montana, and up to 30 mph in eastern Oregon," the NIFC noted in its statement.
  • "These winds caused active fire behavior on the Whitmore, Green Ridge, Black Butte, Thorne Creek, and Woods Creek fires. Extensive smoke continues to blanket California, although many wildfires were active in the late afternoon."

By the numbers: Per the NIFC on Sunday, 25 large fires were burning in Montana, 20 in Idaho, 16 in Oregon, 13 in Washington state, 11 in California, 10 in Alaska and four in Wyoming.

  • Colorado, Utah, Nevada, Arizona, Minnesota, South Dakota, Nebraska and New Mexico had each reported one large fire burning.

What to watch: "The fire outlook continues to reflect warmer and drier conditions leading to the high potential for severe wildfire activity throughout the western United States through the rest of summer and into the fall," per the NIFC.

  • "Widespread high temperatures observed across areas in the West and with periods of lightning activity continue to exacerbate the wildfire situation."

The big picture: The past few months have already seen an unprecedented, deadly heat wave in the Pacific Northwest, with wildfires raging well ahead of peak fire season.

Editor's note: This article has been updated with details of the UN climate report.

Go deeper

Sequoia National Park Forest wraps trees in foil as wildfires approach

View of giant sequoias in Sequoia National Park. Photo: Anne Loustaunou/Corbis via Getty Images

Sequoia National Park Forest officials have wrapped giant sequoia tree trunks in aluminum foil insulation due to two uncontained California wildfires that are projected to spread toward the park.

Why it matters: Giant sequoias are unaffected by most wildfires, but among the trees currently under threat is The General Sherman Tree, which is approximately 2,300 to 2,700 years old.

11 hours ago - Health

FDA advisory panel recommends Pfizer boosters for those 65 and older

A healthcare worker prepares a dose of the Pfizer-BioNTech Covid-19 vaccine at the Key Biscayne Community Center on Aug. 24, 2021. Photo: Eva Marie Uzcategui/Bloomberg via Getty Images

A key Food and Drug Administration advisory panel on Friday overwhelmingly voted against recommending Pfizer vaccine booster shots for younger Americans, but unanimously recommended approving the third shots for individuals 65 and older, as well as those at high-risk of severe COVID-19.

Why it matters: While the votes are non-binding, and the FDA must still make a final decision, Friday's move pours cold water on the Biden administration's plan to begin administering boosters to most individuals who received the Pfizer vaccine later this month.

12 hours ago - World

France recalls ambassadors from U.S. and Australia over submarine deal

Secretary of State Antony Blinken (L), French Foreign Minister Jean-Yves Le Drian (C), and French ambassador to the U.S. Philippe Etienne. Photo: Nicholas Kamm/AFP via Getty Images

France has taken the extraordinary step of recalling its ambassadors to the U.S. and Australia after both countries blindsided their French allies with a new military pact and submarine contract, the French Foreign Ministry announced on Friday.

The backstory: While sealing an agreement with the U.S. and U.K. to acquire nuclear submarines, Australia ripped up an existing $90 billion submarine deal with France. That led senior French officials to accuse the U.S. of a "stab in the back."