Remember atmospheric rivers? Earlier this year, they hit California’s collective consciousness in a big way, as the state reeled from the catastrophic flooding, mudslides and pounding rain they brought with them. This week, much to the dismay of anyone eyeing a weekend outdoors, atmospheric rivers are back and forecast to pour cold water (and snow) on the Bay Area and other parts of California. As Daniel Swain, a climate researcher and the author of the Weather West blog, put it: “Enjoy the upcoming 10 days of ‘Mayuary.’”