GRIDLEY, Calif. – A Northern California wildfire that destroyed a foothill hamlet has become the state's deadliest blaze of the year with 10 people confirmed dead — and the toll could climb as searchers look for 16 missing people.The North Complex fire that exploded in wind-driven flames earlier in the week was advancing more slowly Friday after the winds eased and smoke from the blaze shaded the area and lowered the temperature, allowing firefighters to make progress, authorities said.However, the smoke made for poor visibility and fire helicopters couldn't fly Thursday.In most parts of the state, red flag warnings of extreme fire danger because of hot, dry weather or gusty winds were lifted.