Ten days ago the state set new heat records and brush fires broke out. Burn areas in the Santa Cruz Mountains rekindled. Then, over the last three days, a 2,000-mile-long filament of water in the sky burst over the areas that last week sat brown and smoking. Snow fell on peaks and even some lower hills in the Bay Area. The California Department of Water Resources Central Sierra snow measurement station jumped from 42 percent of average to 62 percent of average.