TAHOE/TRUCKEE — Massive blizzards may become the norm for Tahoe, but don’t get your powder boards out just yet — that doesn’t necessarily mean more snow. A new report from the Environment America Research & Policy Center found that extreme rain and snowstorms in the U.S. now happen on average 30 percent more frequently than in 1948. And the Associated Press reported last week on two upcoming studies that explore how intense, discrete events might not translate to more snow accumulation. The first report found that the number of extreme U.S. snowstorms in the past 50 years is more than …