From past experience I know a lot of the routes stay dry at Shagg in the rain. I'd rather hit Rumney honestly since it's a closer drive for me and the approach isn't as heinous. I also know of plenty of climbs there that will also be dry even if it rains. Right now they are saying a 50% chance of showers at 9am and then it looks clear till 2pm.
I hear ya, except Rumney is 2 hours for me whereas Shagg is 3 plus a 30 - 45 minute approach. Plus the dirt roads on the way to Shagg will probably be a mudfest. If you decide you want to make the trek to Rumney let me know. I'll pm you my cell#