California's fire service reports that the wildfire in Yosemite National Park and surrounding areas has now burned 149,780 acres - an area larger than the city of Chicago.
Firefighters have been trying to bring the flames under control since last week but have only contained 15 percent of the fire.
NBC Bay area reports that 23 structures gave been burned, but that 4,500 are threatened.
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Duncan Jones tweeted: "1 month since dad died today. Made this card for him at Christmas. Due in June. Circle of life. Love you, granddad."
More than 10 days after his body was found, Richard Cole's family claim they are still in the dark over the circumstances of his death.
A cold and frosty start, then staying largely dry with plenty of sunshine.