Snowpack across California is about 110 percent of normal for this time of year, thanks in no small part to an atmospheric river that brought heavy snowstorms to the Sierra range, the state Department of Water Resources’ most recent data show. As of last Friday, the northern Sierra snowpack measured at 113 percent of normal. The central and south Sierra were each observed at 110 percent of normal, for a statewide average of 111 percent, according to DWR’s latest snow survey.