https://phys.org/news/2018-05-latest-lava-homes-evacuation-prep.html > On Friday, fast-moving lava crossed a road and isolated about 40 homes in a rural subdivision, forcing at least four people to be evacuated by county and National Guard helicopters. > The wide lava flow was "very active" Saturday morning and advancing at rates of up to 300 yards (274 meters) per hour, scientists from the Hawaiian Volcano Observatory said.