Set us as preferredExtreme heat is set to roll into Southern California, extending a summer of misery-making stickiness and hot temperatures. “We’ve had so many heat waves,” said V. Kelly Turner, who leads the heat research group at the UCLA Luskin Center for Innovation. The weekend is expected to bring dangerous heat starting Friday, with forecasters warning of elevated risks of heat illness and large wildfires. The weather service has issued an extreme heat warning for much of the area, outside of the coast, from Friday through Sunday. Climate change from the burning of fossil fuels has resulted in hotter, more frequent heat waves, said David Eisenman, professor of medicine and co-director of the UCLA Center for Healthy Climate Solutions.