It is now looking likely that a coastal storm develops along the DelMarVa coast, while strong high pressure is located over northern New England and southeast Canada. Monday night will be very cold, with lows in the teens throughout the region and perhaps some single digits in northwest MA...and 20s Cape Cod and the Islands. Snow is forecast to develop and overspread the area from southwest to northeast during the pre-dawn hours Tuesday. Have used a blend of snow-to-liquid ratios on models to be close to the 10:1 level over the interior...much higher than the wet NBM. It is way too early to forecast snow amounts, but right now it would appear to be Advisory-level with an outside chance of a low-end warning-level. The GEFS ensemble mean would indicate 5 to 7 inches, which is fairly high this far out in time. The GFS puts southern New England in the right rear quadrant of a 125-knot jet across northern New England, which provides good lift. The Canadian tries to combine that northern jet with some a jet streak advancing from the southern Appalachians, but the dual jets do not completely link up. Depending on how close the surface low comes to Nantucket, snow could change to sleet and rain in southern RI and interior southeast MA for a time Tuesday afternoon. Precipitation comes to an end Tuesday night.