(Reuters) -Torrential downpours and damaging winds had left hundreds of thousands of homes and businesses without power in California on Sunday after a deadly week of weather, and the state was still bracing for more heavy rain and snow to fall through Tuesday. Forecasters warned that northern and Central California was still in the path of a “relentless parade of cyclones” on Sunday, promising little relief for the region. Two overlapping phenomena – an immense airborne stream of dense moisture from the ocean called an atmospheric river and a sprawling, hurricane-force low-pressure system kno…