The wildfire raging around the edge of Yosemite National Park is threatening key electricity lines serving San Francisco. The fire has damaged the electrical infrastructure serving the city, and forced the some power lines to shut down. There have been no reports of electricity blackouts, so far.
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.