By any measure, the 2010 growing season has been an outstanding one for Long Island grape growers. Across the island, I'm hearing reports from vineyard folks saying that the grapes are anywhere from 10-20 days ahead of schedule. They're further ahead than in 2007, often lauded as the region's best ever vintage. In 2010, it's been about more than just hot days — cloud cover and the UV rays they can filter have made an impact too. Rich Olsen-Harbich, winemaker at Bedell Cellars, told me a few weeks ago "Not only have we been hot and sunny, but the sunny…