Sporting a pair of gray, paint-splattered, vintage jeans, a teal thermal shirt, two gold chains and a brown beanie, rapper and producer Ovrkast is dancing atop an old pick-up truck on Oakland’s Lakeshore Avenue as a sea of fans swirls around him.  It’s a warm, early October night, just past 9 p.m., an hour when … Continue reading Oakland’s hip hop forecast: Ovrkast, with a good chance of success