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Firefighters monitoring the scene as flames from the Dixie Fire jump across highway 89 near Greenville, California, on Tuesday. Photo: Josh Edelson/AFP via Getty Images

Two massive California wildfires have triggered new mandatory evacuation orders for thousands of people and destroyed homes and businesses in the state's north overnight.

Details: The Dixie Fire, California's biggest blaze, razed houses and businesses as it ripped through the town of Greenville and surrounding areas in Plumas County Wednesday night. The rapidly spreading River Fire burned "multiple" homes as it tore through Placer and Nevada counties, KOVR notes.

  • Mandatory evacuation orders were in effect for both fires.
  • Threat level: Firefighters were facing the threat of extremely dry forests combined with Red Flag fire weather conditions overnight.

By the numbers: As of Wednesday evening, the River Fire had burned 1,400 acres and was 0% contained.

  • The Dixie Fire is now the 8th-largest blaze in California history by acres burned, at more than 274,000 acres so far.
  • Context: Several, but not all, of the fires in northern California have been burning for some time.
  • Illustrating the dangerous conditions in place, the River Fire exploded from a spark on Wednesday to well over 2,000 acres by dusk and growing quickly, threatening several small towns, and billowing smoke more than 30,000 feet into the sky.

Our thought bubble: The extremely dry conditions in northern California are the result of a severe drought, which is the worst the West has seen so far this century.

  • Northern California as well as the neighboring states of Oregon and Washington have also experienced repetitive heat waves this summer that have dried out the forests even more, and shrunk lakes and reservoirs to record low levels.
  • Human-caused climate change is driving an increase in the likelihood and severity of heat waves and droughts, and is behind a trend toward larger wildfires in much of the West in recent years, studies show.
  • Last year was California's worst wildfire season on record. So far, this season is ahead of last year's pace, and the climatological peak of the season doesn't begin for several more weeks.

Go deeper

Gina McCarthy: Extreme heat the "silent killer" from climate change

Photo: Axios

The Biden administration is taking a "whole-government approach" to address the challenges posed by extreme heat, White House climate adviser Gina McCarthy said at an Axios virtual event on Wednesday.

Why it matters: McCarthy's comments come two days after the Biden administration announced a multi-agency plan to combat the threat posed by extreme heat, including addressing inequality in heat exposures.

House passes $768 billion defense spending bill

Photo: Andrew Harrer/Bloomberg via Getty Images

The House approved a $768 billion National Defense Authorization Act (NDAA) for the 2022 fiscal year in a bipartisan 316-113 vote on Thursday.

Why it matters: The annual bill, which authorizes Pentagon spending levels and guides policy for the department, would require women to register for the military draft, among other provisions.

8 hours ago - Politics & Policy

Republicans’ secret lobbying

Illustration: Shoshana Gordon/Axios

The five Senate Republicans who helped negotiate and draft the $1.2 trillion bipartisan infrastructure bill have been privately courting their Republican colleagues to pass the measure in the House.

Why it matters: House GOP leaders are actively urging their members to oppose the bill. The senators are working to undercut that effort as Monday shapes up as a do-or-die moment for the bipartisan bill.