I'd say that if you can see all around that you're not pitched for high winds! I have 2 small (6 in. x 6 in.) sil bags that I clip to the out side corners of my standard HH tarp. I have 2 16 oz soda bottles that I fill with water and place in the bags. This REALLY helps keep the tarp down and (more importantly) eliminates a lot of the flapping noise so I can sleep. Plus, the extra water frequently saves another trip to a water source and gets me out of camp earlier. You can also tie a fist sized rock to the clip.
"A bore is a man who deprives you of solitude without providing you with company." Gian Vincenzo Gravina (1664 - 1718)