A so-called “atmospheric river” is poised to barrel into the Bay Area Wednesday afternoon, delivering a drenching of rain that forecasters say could add up to 3 to 6 inches in the hills and 1 to 3 inches in the valleys in a matter of two days. “The city is likely to see in excess of two inches,” says Ryan Walbrun, a meteorologist with the National Weather Service office in Monterey. “Even places like Livermore where you don’t usually get heavy rain will likely receive more than an inch, so it’s going to be a good soaking for everybody.”