UPDATE: The storm has arrived. Go here for latest updates on the converging 'bomb cyclone' and atmospheric river. Much of Northern California is bracing for one of the strongest storms of the year, as an atmospheric river approaches the region, and with it, the potential for flooding, power outages and landslides. So far, rains were relatively light, but they still managed to knock out power to tens of thousands of PG&E customers. A new, $31 million radar system promises to drastically improve Bay Area weather forecasts.