At AWAC, its up to the captain, remember PIC authority. I know I always check and get the EDCT first and the weather at the destination. If it feels like, I.E. the weather isn't that bad, or its improving, it's best to load up and go wait. Normally it pays off, but again this comes from working the Northeast, and having worked out of ORD so you can get a "feel" of what's going on pretty good.