A structure burns during a wildfire on Wednesday in Laguna Niguel. AP

Firefighters in northern New Mexico labored under an apocalyptic orange sky, and vehicles streamed out of the ski area of Angel Fire on Wednesday as wind-driven flames from the state's second-largest blaze on record roared closer to the mountain resort.

The largest wildfire burning in the United States was heading toward mountain resort towns in northern New Mexico on Wednesday, prompting officials to issue another set of warnings for more people to evacuate as the fast-moving fire picked up momentum.

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The blaze was racing up steep slopes and along exposed ridge lines, with the wind tossing hot embers further into unburned territory giving the fire an even bigger foothold on the tinder-dry landscape.

A general view of the landscape with plumes of smoke near Ocate, New Mexico, US, on Wednesday. Reuters

With winds gusting beyond 50 mph (80 kmh) through dense, drought-parched forests, exhausted crews were at loss to stop a wildfire that has raged across a 45-mile swath of the Sangre de Cristo Mountains for more than a month, destroying hundreds of homes.

After growing more than 50 square miles (130 square kilometres) in a single day, the fire had charred more than 370 square miles (958 square kilometers) by Wednesday morning. That number was growing given the challenges firefighters faced during the afternoon hours.

Evacuations were ordered for villages south of the resort town of Angel Fire, where residents were told to also be packed and ready to go.

Firefighters work to put out a structure burning during a wildfire in Laguna Niguel, California. AP

Spreading through the rugged, tinder-dry landscape with explosive speed, the springtime conflagration has displaced thousands of residents while raising fears that the entire American Southwest was in for a long, brutal fire season.

As smoke hung heavy outside Angel Fire's supermarket, Almeada Martinson said she planned to pack her photos, guns, two dogs and cat, then evacuate to Taos, 17 miles to the west.

Burning now for more than a month, the largest wildfire in the US was spreading toward mountain resort towns in northern New Mexico on Wednesday, prompting officials to issue another set of warnings for more people to evacuate.

Smoke from a wildfire rises above a residential area in Laguna Niguel, Orange County, California. Reuters

"Day 36,” fire spokesman Bill Morse said at a briefing Wednesday night. "Ever since April 6, this fire has grown day by day by day.”

Meanwhile, a wildfire that erupted Wednesday afternoon in coastal Southern California raced through coastal bluffs of multimillion-dollar mansions, burning at least 20 homes, fire officials said. The flames were fanned by gusty ocean winds but they were dying down Wednesday night. No injuries were reported but several streets were ordered evacuated.

The fire, which occurred in Laguna Niguel, was relatively small at about 200 acres (81 hectares) but the wind drove embers into palm trees, attics and dense, dry brush on slopes and steep canyons that hadn’t burned for decades, Brian Fennessy, chief of the Orange County Fire Authority, said at an evening news conference.