Associated Press SAN FRANCISCO The National Weather Service warned Sunday that a Northern California storm could cause flooding in portions of the Russian River and Napa River. The service issued flood warnings for the Napa River at St. Helena for late Sunday night or early Monday morning and for the Russian River at Healdsburg for Monday morning. The Napa River at St. Helena had risen to about 8 feet early Sunday afternoon, below the 19-foot flood level, said Jeff Kopps, a hydrologist at the National Weather Service in Monterey. The Russian River at Healdsburg had risen to about 3 feet,...