Fourteen miles is a pretty long way to go to experiment with your weather protection. I hope you have adequate rain gear for the hike. Like Ironfish45, I have no problem with straight-down rain but I'm in a coastal area and it comes from all directions.
I hear folks talk about site selection, but they must have winds that predictably come from the same direction. I can get all set up so my tarp takes the wind broadside, and then the wind shifts and I'm soaked.
I now have a 4S tarp with doors, but it's not very wide (8.5 ft) and I would really have to pitch it low to fight the conditions I'm talking about.
I hope you don't get conditions like that. If you have a poncho or something, you can hang it to act like a wind block at the end of the tarp that is getting wet. Bring some clips or something to secure it to the tarp/ridgeline.