California firefighters make progress as wildfires push devastation and spread smoke across US West

FOREST RANCH, Calif. (AP) — Firefighters made progress and were aided by improving weather Sunday in the battle against wildfires covering massive areas and leaving a trail of damage in the western United States, but further evacuations and resources have been necessary as thousands of personnel tackle the flames.

The so-called Park Fire, the largest wildfire in California this year, was one of more than 100 blazes burning in the U.S. on Sunday, according to the National Interagency Fire Center. Some were sparked by the weather, with climate change increasing the frequency of lightning strikes as the western U.S. endures blistering heat and bone-dry conditions.

The Park Fire had scorched an area greater than the city of Los Angeles as of Sunday, darkening the sky with smoke and engaging thousands of firefighters. The blaze spanned more than 562 square miles (1,455 square kilometers) of inland Northern California.

Millions of people were under air quality alerts Sunday in the northwestern U.S. and western Canada.

The Park Fire started Wednesday, when authorities say a man pushed a burning car into a gully in Chico and then fled. A man accused of setting the fire was arrested Thursday and is due in court Monday.

Firefighters increased containment to 12% on Saturday, aided by cooler temperatures and more humidity, officials said.

Although cooler-than-average temperatures are expected through the middle of this week, that doesn’t mean existing fires will disappear, said Marc Chenard, a meteorologist at the National Weather Service’s Weather Prediction Center in College Park, Maryland.

A “red flag” warning was in effect for the region on Sunday, meaning dry fuels and stronger winds were increasing the fire danger, the weather service said.

The National Weather Service also issued a “red flag” warnings Sunday for wide swaths of Idaho, Montana, Utah, Colorado and Wyoming, in addition to parts of California.

Fires burned across eastern Oregon and eastern Idaho, where officials were assessing damage from a group of blazes called the Gwen Fire, which was estimated at 43 square miles (111 square kilometers) as of Sunday.

In California, Paradise and several other Butte