By August 18, the fires had expanded to over 35,000 acres (140 km2) with only 4 percent containment.[1] By August 20, the fire burned 140,000 acres (570 km2) and was 5% contained, evacuating people in the East San Jose foothills,[43] and threatening the Lick Observatory with flames.[3] On August 21, the SCU fire had exploded overnight by more than 40%, reaching a total of 230,000 acres (930 km2) and being 10% contained.[44]