Tiny sugars from marine microbes help clouds freeze over the Southern Ocean, offering new insight into cloud brightness and climate models.

Most spots stay storm free, for a change. Lows in the 70s tonight. What’s next? The heat backs off some Friday into the weekend, but humidity does not. Afternoon and evening storm chances increase.

A fter a short-lived heat wave that peaked Thursday, temperatures across the Bay Area slipped back below average over the weekend. It's part of a broader cooling trend that's been in place since the ...