Weather conditions described as potentially historic were on tap for New Mexico on Saturday and for the next several days as hundreds of firefighters and a fleet of airplanes and helicopters worked feverishly to bolster lines around the largest fire burning in the U.S.

Many families already have been left homeless and thousands of residents have evacuated due to flames that have charred large swaths of the Sangre de Cristo Mountains in northeastern New Mexico.

Residents on the fringes of the shifting fire front were holding out hope that all the work done over recent days to clear brush, install sprinklers, run hose lines and use bulldozers to scrape lines will keep the fire from reaching the small city of Las Vegas and other villages to the north and south.

“There’s uncertainty and there’s fear about how the winds are going to affect the fire from day to day,” said Elmo Baca, chairman of the Las Vegas Community Foundation. “Once the people are evacuated out of an area, they can’t go back, so they’re just stuck worrying.”

The blaze has blackened more than 262 square miles (678 square kilometers) over the last few weeks.

The start of the conflagration has been traced in part to a preventive fire initiated by the U.S. Forest Service in early April to reduce flammable vegetation. The blaze escaped control, merging with another wildfire of unknown origin.

Nationwide, close to 2,000 square miles (5,180 square kilometers) have burned so far this year, with 2018 being the last time this much fire had been reported across the country, according to the National Interagency Fire Center. And predictions for the rest of the spring do not bode well for the West, where long-term drought and warmer temperatures brought on by climate change have combined to worsen the threat of wildfire.

Forested areas in southern New Mexico, Arizona and Colorado also saw an early start with blazes forcing evacuations and destroying homes last month.

Incident Commander Dave Bales said firefighters working in northeastern New Mexico have been focused on protecting homes and other structures that hold generations of sacred memories.

“It’s hard when I see so many people displaced,” he said, noting that many hugs have been shared around town.

The crews have seen extreme wind events before that usually last a day, maybe two. But Bales said this event could last five or more days with gusts topping 50 to 60 mph (80 to 96 kph). He also warned that flames could be carried up to a mile away.

“This is an extreme wind event that is unprecedented,” Bales said.

Another large wildfire burning in New Mexico was within 5 miles (8 kilometers) of Los Alamos National Laboratory, one of the nation’s key facilities for nuclear research and future production of plutonium components for nuclear weapons.

Crews have burned vegetation ahead of the fire in an effort to reduce its intensity and the potential for spot fires. At the lab, water tankers, a helicopter and heavy equipment are in position and firefighters will patrol the perimeter if flames gets closer.

Some nuclear watchdog groups and environmentalists have raised concerns about containers of nuclear waste on lab property. That includes six shipments of 109 containers awaiting transport to the federal government’s underground waste repository, state officials said.

Lab officials said Friday that radiological and other potentially hazardous materials are stored in containers engineered and tested to withstand extreme environments, including heat from fire.

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By SUSAN MONTOYA BRYAN Associated Press

Montoya Bryan reported from Albuquerque, New Mexico. Associated Press writer Felicia Fonseca in Flagstaff, Arizona, contributed to this report.