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Wind-driven walls of flame have prompted mass evacuations of homes in Southern California and badly injured two firefighters, as hundreds of thousands of residents endured a second day of power shutoffs meant to counter heightened fire risks from gusty, dry weather. Firefighters position in a residential area and monitor flames climbing a ridge toward homes at the Blue Ridge Fire in Yorba Linda, California. Photo: AFP The latest threats came amid what meteorologists called the strongest onslaught of extreme winds - and lowest humidity levels - yet documented during a California wildfire season already ranked as the worst on record in terms of acreage burned. Fires have scorched more than 16,500 square kilometres - equivalent to the land mass of the state of Hawaii - since the start of the year, with thousands of homes destroyed and 31 lives lost. Red flag warnings for incendiary weather conditions remained posted across much of California due to extreme winds producing gusts in excess of 129km/h, according to the California Department of Forestry and Fire Protection. Illustrating the hazards posed by California's latest bout of dry, desert-born winds, a blaze dubbed the Silverado fire erupted early Monday (Tuesday NZT) and spread across 2913 hectares of Orange County by late afternoon, county fire authority spokesman Thanh Nguyen told Reuters. Some 90,800 residents were ordered evacuated from homes in and around the city of Irvine as the fire raged largely unchecked through drought-parched brush in the canyons and foothills of the Santa Ana Mountains south of Los Angeles, officials said. No property losses were immediately reporte, but two firefighters among an estimated 500 personnel battling the flames with bulldozers and hand tools were hospitalized with severe burns, authorities said. A second Orange County blaze, the Blueridge fire, later broke near Yorba Linda and has charred roughly 485 hectares, Nguyen said. Local television news footage showed at least one home gutted by flames. Precautionary outages Utility company Southern California Edison reported shutting off electricity to 21,000 homes and businesses in the region as a precautionary measure in the face of elevated fire risks posed by dangerously high winds. Hundreds of miles away, the Pacific Gas and Electric Company (PG&E) said it had cut off power to more than 350,000 of its customers for the same reason. Wind-damaged electrical lines have been implicated in causing dozens of devastating California wildfires in recent years, and utilities have increasingly resorted to such "public safety power shutoffs" to reduce the risk. Wind gusts were clocked at up to 143km/h in Sonoma County wine country north of San Francisco Bay, and were steadily blowing at more than 80km/h elsewhere through the region. "It's the strongest wind event, and the lowest humidity event, for this fire season," National Weather Service forecaster Jim Mathews told Reuters. By midday Monday, PG&E said it was beginning to restore electrical service to some customers "where it is safe to do so," with most of the shutoffs expected to be ended by Tuesday night (Wednesday NZT) as winds abated, the utility said in a statement. The latest outbreak of fires capped a summer of record California wildfire activity stoked by increasingly frequent and prolonged bouts of extreme heat, drought, wind and dry lightning storms that scientists point to as a consequence of climate change. Further east in drought-stricken Colorado, an Arctic storm sweeping the Rockies over the weekend dumped 15-40cm of snow on the two largest wildfires in that state's history. "The snow has improved our chances of getting them contained, but we're still a way off," said Larry Helmerick, spokesman for the Rocky Mountain Area Coordination Center. The two blazes combined have so far blackened well over a quarter-million acres. - Reuters