Large swaths of California will be pounded by rain this week, offering a bit of relief as the state enters a sixth year of drought. Southern California was hit by scattered showers — with some areas experiencing thunder, lightning and spells of heavier rain — as a storm moved through the region late Sunday and early Monday. A bigger storm is expected later in the week. The Bay Area, meanwhile, was drenched with more than an inch of rain Sunday and Monday with a heavier storm that could reach as far north as Sonoma County expected later in the week.