When Paul and Shannon Brock purchased Silver Thread Vineyard last summer, I immediately wondered about their first vintage and wines. 2011 was a challenge for even the most experienced growers — growers who had been taking care of their vines for the entire growing season. The Brocks came in in what amounts to the fourth quarter of the game. Having tasted a few of Paul’s first wines (he’s the winemaker), those worries seem to be unwarranted. The Silver Thread 2011s deliver the same bright, clean flavors as many of those he made at Lamoreaux Landing a few years ago. Silver Thread…