NASA-JPL A large mass of colder-than-normal water across the equatorial Pacific, shown Dec. 7, 2017 in this satellite image, is a classic sign of La Niña conditions, scientists say, which historically have increased the likelihood of dry winters in California. Californians are beginning to wonder: Is the state heading back into a drought? While experts say it’s still too early in the winter rainy season to say for sure, the evidence is accumulating, and the rain is definitely not. La Niña conditions in the Pacific Ocean — the cooling of ocean waters near the equator that have historically increased the...