Anyway the wave clearly has a low level circulation that throughout the day has seemingly tightened even being nearly devoid of convection.. I would imagine if the circulation continues to tighten then the low level convergence may increase enough to combat some of the dry air inhibiting the system now and we may be looking at another invest sometime tomorrow ..
http://www.ssd.noaa.gov/goes/east/tatl/loop-ir2.html
there is some decent vorticity which is apparent in the loop..