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The scene of the Glass Fire in St. Helena, in Napa County, California, on Sunday. Photo: Josh Edelson/AFP via Getty Images

Firefighters in the western U.S. were facing "critical fire weather conditions," as a rapidly spreading new wildfire in Northern California prompted fresh evacuations Sunday.

Why it matters: Wildfires have burned a record 3.6 million acres in California this year, killing 26 people and razing over 7,600 structures, per Cal Fire. Utility provider Pacific Gas & Electric cut power to 11,000 customers early Sunday and planned outages for 54,000 others later in the day because of fire risks.

What's happening: The Glass Fire prompted mandatory evacuation orders for Napa County communities in California's wine country after the blaze broke out Sunday morning and quickly spread across 1,500 acres with 0% containment.

  • Red flag warnings were issued "across a large portion of California, the central Rockies and the High Plains," per the National Weather Service (NWS).

The big picture: 69 large fires were burning across the U.S. on Sunday — including 20 in California, 14 in Idaho, 11 in Oregon and 10 in Montana, per the National Interagency Fire Center.

  • After cooler, damper conditions earlier in the week, dry and windy conditions were promoting "elevated to critical fire weather conditions across a broad area of the western U.S. into the Plains," the NWS said.

Threat level: Cal Fire noted red flag warnings were in effect until Monday, affecting most areas from Trinity County down through the Diablo Range and Central Sierra Mountains, with low humidity bringing critical fire weather conditions.

  • "Gusty winds and low humidity will bring critical fire weather, as well as unseasonably high temperatures," Cal Fire said.
  • "A Fire Weather Watch is in effect for later in the weekend into Monday for strong winds and low humidity affecting the Western Klamath in the north and the San Gorgonio Pass and Inland Empire in the south. High pressure brings elevated temperatures across the state through the weekend and into next week."

Editor's note: This article has been updated with the more information on the weather and the fire threat.

Go deeper

Over 300,000 Californians affected by PG&E blackouts

High tension towers in Los Angeles. Photo: Apu Gomes/AFP via Getty Images

Pacific Gas & Electric (PG&E) announced Sunday that it would begin power shut-offs for roughly 361,000 California customers due to dry weather that could risk wildfire spread.

Where it stands: Cal Fire identified two new fire incidents late on Sunday that have spread through 70 acres. Two other major fires in the state are 80% and 30% contained.

Schumer: Trump impeachment trial to start week of Feb. 8

Senate Majority Leader Chuck Schumer. Photo: The Washington Post via Getty

The Senate will begin former President Trump's impeachment trial the week of Feb. 8, Majority Leader Chuck Schumer announced Friday on the Senate floor.

Why it matters: Trump is the only president in U.S. history to be impeached twice. The House voted to impeach the former president on Jan. 13 on a single charge: incitement of insurrection for the Jan. 6 breach of the U.S. Capitol, which resulted in five deaths.

1 hour ago - Health

CDC extends interval between COVID vaccine doses for exceptional cases

Photo: Joseph Prezioso/AFP via Getty

Patients can space out the two doses of the coronavirus vaccine by up to six weeks if it’s "not feasible" to follow the shorter recommended window, according to updated guidance from the Centers for Disease and Control and Prevention.

Driving the news: With the prospect of vaccine shortages and a low likelihood that supply will expand before April, the latest changes could provide a path to vaccinate more Americans — a top priority for President Biden.