Brutal heatwave headed for US west, raising health fears

Temperatures are expected to hit 115F (46C) in the coming days across parts of southern California, Sacramento and the San Joaquin Valley, according to the National Weather Service. In Death Valley, temperatures were forecast to reach more than 120F (49C).

Extreme heat warnings have been triggered up and down the state, including in the Bay Area. Temperatures are expected to build throughout the week, with northern and southern California bracing for the highest temperatures during the long weekend.

High temperatures are also expected to accelerate the formation of ground-level ozone, or smog, which exacerbates respiratory issues. In southern California, officials have issued an ozone advisory due to the heatwave, advising people to stay indoors and avoid physical exertion.

Officials also warn that the high temperatures could further prime the parched, drought-addled west for wildfires. Parts of the west have already seen an explosive spring and summer, with major fires in the south-west and Alaska.