California wildfires turn San Francisco sky eerie yellow

A massive wildfire burning in Northern California grew in size over the weekend, sending ash and smoke as far south as San Francisco, turning the sky an eerie yellow.

The fire that started Saturday about 160 kilometres northeast of San Francisco spread as strong winds pushed smoke south, dusting cars and homes with a thin layer of grey ash. About 300 people were told to flee their homes.

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Fire officials said nearly 700 homes and other structures were threatened as a result of the fast-moving wildfire. No injuries have been reported.

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San Francisco residents shared photos on social media showing the city choked by ash and smoke as a yellow haze washed over the city, resembling a sepia tone Instagram filter.

“SF looks like it has a sepia tone applied to it because of smoke from the wildfire,” Chris Sánchez tweeted.

“San Francisco sky is bizarre right now. Rayleigh scattering through this cloud is depleting all the blues and leaving us with a sepia sky,” Rick Zuzow tweeted.

The County Fire, which broke out on Saturday afternoon in rural Yolo County, west of Sacramento, blackened more than 24,280 hectares of grass and brush and was only five per cent contained late on Monday.

Here’s a look at more images from the San Francisco Bay area.

–with a file from the Associated Press