Mount Holly's thoughts on the model discrepancies-
The biggest uncertainty (as usual) is with QPF, with the GFS much drier than the ECMWF/NAM (roughly middle of the road), and the CMC much wetter. This is clearly tied to how close the newly developing low tracks to the coast, with the CMC nearest the CWA and the GFS/NAM much farther offshore. The ECMWF is well between the two extremes and agrees with ensemble means as well. Given these factors, used a blend of model QPF for the Wednesday/Wednesday night forecast as well, but with slightly more weight to the ECMWF and NAM. The result is widespread 1-2 inch totals (highest amounts north and east). Notably, the GFS features totals about 50-75 percent of these values, with the CMC in the range of 2-4+ inches. (In other words, large uncertainty remains.)