California, Oregon and Washington are ablaze with some of the worst wildfires in years. Millions of acres have burned, with homes and towns destroyed, as well as loss of life. But even when wildfires strike the region every year, why are the fires this year so bad?
About 100 wildfires are running riot on the west coast, and several people are already confirmed dead
Shocking images have emerged showing bright orange skies over the west coast as the fires spread further north.
Fanned by winds amid record heat, the blazes have burnt millions of acres, destroyed thousands of homes, and killed at least 25 people.
On Friday Oregon Governor Kate Brown said dozens were missing in her state alone.
The fires have burnt a total 4.5m acres – an area larger than Connecticut and slightly smaller than Wales – in recent weeks, according to the National Interagency Fire Center.
Oregon’s governor said this “could be the greatest loss of human life and property” to fires in state history.
According to the National Interagency Fire Center, there are 96 large fires in the western US.
More than 3.4 million acres have burned so far, with tens of thousands of acres burning every day in California, Oregon and Washington.
Even when the fuel is ready and in place, it needs something – or someone – to light it.
Deadly fires can start by accident – for example, the 2018 Carr Fire was sparked by a blown-out tire on a truck.
When the rim of the wheel scraped the ground, it sent out sparks – and started a fire on the nearby vegetation.
Sometimes fires are started by human carelessness – a fire raging in California as we speak was sparked by fireworks at a gender reveal party.
Santa Ana winds
Still yet to come, but often responsible for spreading fires, are the yearly Santa Ana winds.
Every autumn, strong gusts known as the Santa Ana winds bring dry air over the state from the Great Basin area.
This makes up a second fire season that runs from October through April.
Those fires tend to spread three times faster and burn closer to urban areas, and they were responsible for 80 percent of the economic losses over two decades beginning in 1990.