California's Caldor Fire triggers fresh evacuations near Lake Tahoe

What they're saying: Jeff Marsoleis, forest supervisor for El Dorado National Forest, said firefighters thought they could stop the fire's spread, but "today it let loose," per Associated Press.

• Cal Fire Division Chief Eric Schwab noted to AP that "we’ve been seeing about a half-mile of movement on the fire’s perimeter each day for the last couple of weeks, and today, this has already moved at 2.5 miles on us, with no sign that it’s starting to slow down."

Threat level: The National Weather Service issued a red flag warning for areas including around Lake Tahoe and the Caldor Fire zone, effective from 11am Monday to 11pm PT on Tuesday, with strong southwesterly winds and more triple-digit temperatures expected for the region.

The big picture: The Caldor Fire ignited on Aug. 14 in the Omo Ranch area and has been "steadily pushing eastward toward the basin," the Sacramento Bee reports.

Context: Scientists have tied these extreme weather events to climate change.

• A sweeping UN-sponsored Intergovernmental Panel on Climate Change report published this month found that the connection between human emissions of greenhouse gases and global warming is "unequivocal."