The Eaton and Palisades fires are now the most destructive wildfires in Southern California history, according to Cal Fire. Follow for live updates.

The Eaton Fire burning just north of Los Angeles and the Palisades Fire that destroyed much of the seaside LA neighborhood of Pacific Palisades broke out Jan. 7 in conditions similar to what’s expected Wednesday. High winds last week pushed flames at remarkable speed and carried fire-sparking embers sometimes miles away.

The threat of powerful wind gusts, combined with bone-dry humidity, in Los Angeles on Wednesday could test firefighters who have been battling to keep monstrous fires in Los Angeles in check since last week.

Containing wildfires—never mind extinguishing them—in parched and windy conditions can be monstrously difficult. Dry vegetation is rocket fuel for blazes and wind both feeds the flames and spreads the embers. “The winds are like pointing an air blower at a fireplace,” says Gershunov, “except it’s not contained and it’s on a much larger scale.”

Millions of Southern Californians were on edge as a final round of dangerous fire weather was forecast for the region on Wednesday, along with a rare warning of a “Particularly Dangerous Situation” for an area near where two massive blazes have killed at least 25 and destroyed thousands of homes.

Millions of Southern Californians nervously kept watch as winds began picking up Wednesday during a final round of dangerous wildfire weather forecast for the region where two massive blazes have killed at least 25 people and destroyed thousands of homes.