A plume of smoke from wildfires in the US state of California has descended on the San Francisco area, causing the sky over the region to turn orange.
Cars drive along the San Francisco Bay Bridge under an orange smoke filled sky at midday in San Francisco, California on 9 September, 2020. Photo: AFP / Harold Postic
Some 14,000 firefighters are battling 28 major blazes across California, amid a historic heatwave.
Wildfires have burned more than 2.5 million acres in the state this year, killing at least eight people.
On Wednesday, strong winds blew smoke and ash from some of those blazes in northern parts of the state.
The San Francisco skyline is obscured in orange smoke and haze as their seen from Treasure Island in San Francisco, California on 9 September, 2020. Photo: AFP / Brittany Hosea-Small
Residents of San Francisco and the surrounding areas woke up to darkened skies, disorientating some, who thought it was still night time.
"It feels like the end of the world," Catherine Geeslin, who lives in the West Portal area of the city, told the San Francisco Chronicle.
"It was alarming to see it's still dark. And it will be strange to have lunch in the dark. But you still have to get on with your day."
An orange sky filled with wildfire smoke hangs above hiking trails at the Limeridge Open Space in Concord, California, on 9 September, 2020. Photo: AFP / Brittany Hosea-Small
Local media reported that it still appeared to be dawn at 10:45 (18:45 BST), as the sun's rays struggled to penetrate the thick smoke.
On Wednesday, officials said three people had died in northern California.
The sun is seen behind smoke from the Bobcat fire rising above in the Angeles National Forest above Duarte, California on 7 September, 2020. Photo: AFP / Robyn Beck
In a tweet, Daniel Swain, a climate scientist at the University of California, Los Angeles (UCLA), said "extremely dense" and "tall smoke plumes" were "almost completely blocking out the sun".
That smoke, experts said, was also behind the sky's orange glow.
In this long exposure photograph, flames set ablaze both sides of a segment of Lake Berryessa during the Hennessey fire in the Spanish Flat area of Napa, California on 18 August, 2020. Photo: AFP / Josh Edelson
Smoke particles from the wildfires "only allow yellow-orange-red light to reach the surface, causing skies to look orange", the Bay Area Air Quality Management District explained on Twitter.
"This is not a common sight because this takes very specific conditions in order for this to happen," National Weather Service (NWS) forecaster Brian Garcia told SFGate. "Obviously, you need fires that have ample smoke production."
In this long exposure photograph, embers fly off a burning tree during the Hennessey fire in the Spanish Flat area of Napa, California on 18 August, 2020. Photo: AFP / Josh Edelson
As wildfires continue to burn, forecasters expect similar conditions in the coming days.
Meanwhile in Oregon, Governor Kate Brown said this was a "once-in-a-generation event" that could bring about "the greatest loss in human lives and property in the state's history". Officials said at least two people had been killed.
In Washington state, a one-year-old boy died after his family was apparently overrun by flames while they attempted to flee their property.
Photo: AFP / Josh Edelson
A firetruck drives along a closed Interstate 80 as flames from the LNU Lightning Complex fire continue to spread in Fairfield, California on 19 August, 2020. Photo: AFP / Josh Edelson
- BBC