The last in a series of “October surprise” storms drenched the Bay Area on Sunday, filling reservoirs, downing power lines, and causing flash flood warnings in the Santa Cruz Mountains. Though the water was welcome to much of the parched region, the deluge brought more trials and misery to the hardy folk who survived the devastating Loma fire earlier this month. Boulders crashed, creeks raged, trees toppled and rain seeped into damaged homes.The weather is expected to clear up Monday and grow warmer throughout the week.