After a parade of atmospheric river systems from late December through mid-January and a whopper of a winter storm earlier this week, California’s snowpack levels have surged to near-historic highs. “This snowpack actually rivals 1982-83, which is the largest snowpack on record,” de Guzman said. Winter storms during March, including one forecast for this coming weekend, will determine whether the state breaks the all-time record. The southern Sierra has been on pace since mid-January to break the all-time record for that region, de Guzman said. California’s drought conditions easingWet and snowy weather has greatly improved California’s drought conditions, at least in the immediate term.