"We no longer have a fire season - we have a fire year," Orange County Fire Authority Chief Brian Fennessy said during a briefing. "It's February 10. It's supposed to be the middle of winter. We're anticipating 80-, 90-degree weather."
Storms drenched the state in December but then vanished.
This week, Southern California has had a heat wave as high pressure over the interior of the West sends extremely dry air toward the coast, creating the Santa Ana winds that raise temperatures, sap moisture from vegetation and elevate fire danger.
The prospect of winter no longer offering some protection from wildfire is ominous for a state that has been enduring huge conflagrations in recent years.
Last year, California wildfires scorched more than 4,000 square miles and more than 3,600 structures burned, according to preliminary data from the California Department of Forestry and Fire Protection.
In 2020, a staggering 6,600 square miles and nearly 9,250 structures burned.
Cal Fire's report on the 2020 fire siege noted: "Since 2015, the term 'unprecedented' has been used year over year as conditions have worsened, and the operational reality of a changing climate sets in."
The U.S. Drought Monitor's report Thursday showed that the recovery started by the December deluge has stalled: More than 99% of California remains in drought, much of it categorized as severe.
The battle against the Emerald Fire benefitted from the rapid arrival of extensive firefighting resources: 75 fire engines, five helicopters, four air tankers, five hand crews and two bulldozers.
Fennessy said it was fortunate that the Emerald Fire was the only active wildfire in the state and there was no competition for resources, which he noted was not the case when the disastrous 1993 Laguna Beach fire occurred.
But he pointed out that windy, dry and hot weather was forecast to continue for several more days and resources could still get stretched.
Fennessy said arson investigators were on the scene where the fire started. He confirmed that there were power lines in the area but added that he would not speculate on the cause.
"The fire was on the side of a hill. The way fire spreads I'd imagine it started somewhere below that. There were wires in the area but I don't know," he said.
The Associated Press contributed to this report.