Ash carried seven miles through the air had fallen on Las Vegas, a population of around 13,000, and firefighters were trying to keep the blaze from getting any closer, said team spokesman Mike Johnson. fire management.

But firefighters warned of windy conditions expected in the coming days, as well as impacts from smoke, and officials urged residents to remain alert for possible evacuation orders.

Stewart Turner, a fire behavior analyst with the fire management team, warned on Saturday of a “very serious week” ahead with the forecast winds.

More extreme fire danger was forecast Sunday for parts of New Mexico, Arizona, Nevada and Colorado, according to the National Weather Service.

Map images indicated the blaze that burned at least 166 homes grew from 103 square miles (266 square kilometers) on Friday to 152 square miles (393 square kilometers) early Saturday, officials said. The fire was described as 30% contained during a briefing on Saturday evening.

Winds in northern New Mexico gusted up to 65 mph (105 km/h) on Friday before easing as night fell. By Saturday, planes offloading fire retardant and water could resume flights to help ground crews and bulldozers.

The rapid growth of the fire on Friday forced crews to repeatedly change position due to threatening conditions, but they were able to re-engage immediately without being forced to retreat, Coil said. No injuries were reported.

The blaze began on April 6 when a prescribed burn set up by firefighters to remove small trees and brush that can fuel the fires was declared out of control. This fire then merged with another wildfire a week ago.

With the fire’s recent growth, estimates of the number of people forced to evacuate from largely rural areas and a subdivision near Las Vegas have doubled from 1,500-2,000 people to between 3,000-4,000 , said Jesus Romero, assistant director of the county of San Miguel.

Officials said the fire destroyed 277 structures, including at least 166 homes. No updated damage assessment was available Saturday, Romero said.

Wildfires were also burning elsewhere in New Mexico and Arizona. The fires are burning unusually hot and fast for this time of year, especially in the southwest, where experts said some woods in the region were drier than kiln-dried wood.

Wildfires have become a year-round threat in the West given changing conditions that include earlier snowmelt and later rains in the fall, scientists said. The problems have been exacerbated by decades of fire suppression and mismanagement, as well as a 20-plus-year mega-drought that studies have linked to human-induced climate change.

In northern Arizona, firefighters approached full containment of a 30 square mile (77 square kilometer) blaze that has destroyed at least 30 homes near Flagstaff and forced hundreds more to evacuate. On Friday, a high-level national forest fire management team handed over firefighting oversight to local firefighting forces.

Arizona’s National Forests announced it would impose fire restrictions starting next Thursday that would limit campfires to developed recreation sites and restrict smoking inside vehicles, other enclosed spaces and at recreational sites.

Davenport reported from Flagstaff, Arizona. Associated Press writer Felicia Fonseca in Flagstaff and Scott Sonner in Reno, Nevada, contributed to this report.