Strong wind was the biggest issue on this afternoon and evenings work. I got an earlier start but the darn wind nearly blew me off the roof. Luckily it was out of the south so the only time it caused me grief with the shingling was at the ends getting started and finishing. I hit it pretty hard getting 3 2/3 square nailed down and three of the 6 roof vents installed. The west end of the shop is sealed up over the ridge but I still have about 5 foot of open roof on the east end of the north slope. I must apologize for the picture quality, it was nearly dark when I quit tonight. The picture below shows one of the roof ventilators up close since they don't show up too well in the distance shot.