The National Weather Service’s highest level red flag warning remained in effect in parts of Los Angeles and Ventura as dangerously strong winds—which could worsen the wildfires burning across the region—are expected to pick up overnight and peak on Wednesday morning as progress in containing the two largest blazes in the area remained slow.

The strongest gusts are expected Tuesday morning and early afternoon, which will then be followed by a break in the evening.

Millions of Southern Californians are on edge as a final round of dangerous fire weather is forecast for the region, along with a rare warning of a “Particularly Dangerous Situation.”