The approach of a mid/upper level shortwave currently analyzed over the mid-MS River Valley and low pressure forecast to develop over eastern NC due to a residual baroclinic zone will bring another round of wintry precipitation to portions of the Northeast and New England late on day 1 (Sunday) through day 3 (Tuesday). A lack of deep phasing and separation between the mid-level wave and low will keep precipitation relatively light over portions of PA/interior NY where a few inches of snow are forecast. But as the low approaches the Gulf of Maine, it will slow or even retrograde back to the west/southwest as its caught up in the deepening/closing off mid-level energy. This could support a prolonged period of snow across coastal NH to much of Maine in th day 2/3 time-frame, though there remains considerable uncertainty in the evolution and QPF. Deterministic runs of the latest guidance did trend upward, particularly for Maine where there is a signal for winter storm criteria to be met or exceeded. However, given the uncertainty and model spread still, the blend favored the ECENS/ECMWF runs. This system bears watching.