A smoky fire exploded in size to over 29 square kilometres after breaking out around dawn in Orange County, south of Los Angeles.
The fires that began early morning on Sunday in the famed Napa-Sonoma wine country north of San Francisco came on the third anniversary of deadly wildfires that erupted in 2017, including one that killed 22 people.
Fire crews are out in force, scrambling to fend off flames threatening neighbourhoods and vineyards in the northwest corner of the famed wine-growing valley
Thousands of blazes are sweeping through the Pantanal, the world's largest wetland, threatening one of the most biodiverse ecosystems on the planet.
Oregon’s emergency management director has said officials were preparing for a possible “mass fatality event” if many more bodies turn up in the ash.
The true scale of destruction is impossible to gauge across California, Oregon and Washington, which are cut off by a wall of flames.
One of the largest group of fires, dubbed the LNU Lightning Complex, has scorched nearly 89,000 hectares, burned nearly 500 structures and forced the evacuation of tens of thousands of people.
The main blaze, dubbed the Lake Fire, has already scorched over 4,451 hectares and forced 250 people from their homes since erupting on Wednesday afternoon in the Angeles National Forest.
Video footage shot by Reuters on Sunday showed plumes of black smoke billowing into the sky and trees still ablaze, with firefighters in helicopters trying to put out the fires.
Australia has been battling hundreds of blazes since September in an unusually prolonged summer wildfire season that was fuelled by three years of drought, which experts have attributed to climate change.
This is the first such warning for Canberra since 2003.
The Animal Rescue Craft Guild has supplied thousands of rescue groups around the country with protective pouches and blankets to help wildlife affected by Australia's bushfires.
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