For those holding out hope for late week, that stretched out vort max dropping down from Central Canada on Thursday is the feature to watch. It ultimately will act as the kicker, but if it digs a bit further west as it heads south, it can turn the flow a bit more ENE instead of due East. The runs that have been interesting, esp the 0z Euro and CMC, have this feature sharper and digging further west. It's a long shot for DC north any way you slice it, but there is a chance for southern parts of the region to get in on the northern fringe of the precip shield.